diff --git a/gui/src/components/Header.tsx b/gui/src/components/Header.tsx
index 77ff659..3ddab8e 100644
--- a/gui/src/components/Header.tsx
+++ b/gui/src/components/Header.tsx
@@ -9,6 +9,6 @@ type HeaderProps = {
 export const Header: React.FC<HeaderProps> = ({ title }) => {
   const navigate = useNavigate();
   return <>
-    <h2 className="card-title" data-tauri-drag-region><button onClick={() => navigate('/')}><AiOutlineLeft /></button>{title}</h2>
+    <h2 className="card-title" data-tauri-drag-region><button onClick={() => navigate(-1)}><AiOutlineLeft /></button>{title}</h2>
   </>
 }
diff --git a/gui/src/components/RunPanel.tsx b/gui/src/components/RunPanel.tsx
index 1fa1fc1..1cd818a 100644
--- a/gui/src/components/RunPanel.tsx
+++ b/gui/src/components/RunPanel.tsx
@@ -3,7 +3,7 @@ import { usePromise } from 'hooks/usePromise';
 import React, { useEffect, useRef, useState } from 'react'
 import { useTranslation } from 'react-i18next';
 import { canExport, getProfile, setProfile } from 'services/config';
-import { run, useLog } from 'services/s3si';
+import { addLog, run, useLog } from 'services/s3si';
 import { Checkbox } from './Checkbox';
 import { Loading } from './Loading';
 
@@ -24,6 +24,10 @@ export const RunPanel: React.FC<RunPanelProps> = () => {
   const onClick = async () => {
     setLoading(true);
     try {
+      addLog({
+        level: 'log',
+        msg: ['Export started at', new Date().toLocaleString()],
+      })
       const { state } = result;
       const newState = await run(state, {
         exporter: "stat.ink,file",
@@ -35,14 +39,24 @@ export const RunPanel: React.FC<RunPanelProps> = () => {
         ...result,
         state: newState,
       })
+    } catch (e) {
+      console.error(e)
+      addLog({
+        level: 'error',
+        msg: [e],
+      })
     } finally {
+      addLog({
+        level: 'log',
+        msg: ['Export ended at', new Date().toLocaleString()],
+      })
       setLoading(false);
     }
   }
   const disabled = !canExport(result);
 
   return <>
-    <div className="tooltip" data-tip={disabled ? t('请先完成登录和stat.ink的API密钥设置') : undefined}>
+    <div className="tooltip" data-tip={disabled ? t('请先在设置中完成Nintendo Account登录和stat.ink的API密钥') : undefined}>
       <Checkbox disabled={disabled || loading} value={exportBattle} onChange={setExportBattle}>{t('导出对战数据')}</Checkbox>
       <Checkbox disabled={disabled || loading} value={exportCoop} onChange={setExportCoop}>{t('导出打工数据')}</Checkbox>
       <button
diff --git a/gui/src/hooks/useSubField.ts b/gui/src/hooks/useSubField.ts
new file mode 100644
index 0000000..8ce8cf2
--- /dev/null
+++ b/gui/src/hooks/useSubField.ts
@@ -0,0 +1,86 @@
+type Maybe<T> = T | null | undefined;
+type KeyOf<T extends Record<string, any>, K = keyof T> = K extends string ? (T[K] extends Function ? never : K) : never;
+type DotField<T extends Maybe<Record<string, any>>, K = KeyOf<NonNullable<T>>> = K extends string
+  ? K | `${K}.${DotField<NonNullable<T>[K]>}`
+  : never;
+type ValueOf<T extends Record<string, any>, K> = K extends `${infer I}.${infer R}`
+  ? ValueOf<NonNullable<T>[I], R>
+  : K extends string
+  ? NonNullable<T>[K]
+  : never;
+export type FormProps<T> = {
+  value: T;
+  onChange: (value: T) => void;
+};
+
+const pick = <T extends Record<string, any>, K extends keyof T>(obj: T, keys: K[]): Pick<T, K> => {
+  const ret = {} as Pick<T, K>;
+  keys.forEach((key) => {
+    ret[key] = obj[key];
+  });
+  return ret;
+};
+
+export const mapFormProps = <T, U>(
+  formProps: FormProps<T>,
+  { mapValue, mapOnChange }: {
+    mapValue: (v: T) => U;
+    mapOnChange: (v: U) => T;
+  },
+): FormProps<U> => {
+  const { value, onChange } = formProps;
+  return {
+    value: mapValue(value),
+    onChange: (value: U) => onChange(mapOnChange(value)),
+  };
+};
+
+export const useSubField = <T extends Record<string, any>>({
+  value,
+  onChange,
+}: {
+  value: T;
+  onChange?: (cb: (value: T) => T) => void;
+}) => {
+  const subField = <K extends DotField<T>>(key: K): FormProps<ValueOf<T, K>> => {
+    const v = key.split('.').reduce((o, x) => (o ?? {})[x], value) as ValueOf<T, K>;
+    return {
+      value: v,
+      onChange: (v: ValueOf<T, K>) => {
+        const setInner = <O extends Record<string, any>>(o: O, k: string[], v: any): O => {
+          const [head, ...tail] = k;
+          let out;
+          if (tail.length === 0) {
+            out = {
+              ...o,
+              [head]: v,
+            };
+          } else {
+            out = {
+              ...o,
+              [head]: setInner(o[head], tail, v),
+            };
+          }
+          return out;
+        };
+        onChange?.((old) => setInner(old, key.split('.'), v));
+      },
+    };
+  };
+  const subKeys = <K extends keyof T>(keys: K[]) => {
+    return {
+      value: pick(value, keys),
+      onChange: (v: Pick<T, K>) => {
+        onChange?.((old) => ({
+          ...old,
+          v,
+        }));
+      },
+    };
+  };
+
+  return {
+    subField,
+    subKeys,
+  };
+};
diff --git a/gui/src/jsonrpc/client.ts b/gui/src/jsonrpc/client.ts
index d82d182..2309eb1 100644
--- a/gui/src/jsonrpc/client.ts
+++ b/gui/src/jsonrpc/client.ts
@@ -10,6 +10,12 @@ import {
   Transport,
 } from "./types";
 
+export class JSONRPCError extends Error {
+  constructor(public rpcError: ResponseError) {
+    super(rpcError.message);
+  }
+}
+
 export class JSONRPCClient<S extends Service> {
   protected nextId = 1;
   protected transport: Transport;
@@ -103,7 +109,7 @@ export class JSONRPCClient<S extends Service> {
     return new Promise<R>((res, rej) => {
       this.requestMap.set(req.id, (result) => {
         if (result.error) {
-          rej(result.error);
+          rej(new JSONRPCError(result.error));
         } else {
           res(result.result);
         }
@@ -114,9 +120,7 @@ export class JSONRPCClient<S extends Service> {
   getProxy(): S {
     const proxy = new Proxy({}, {
       get: (_, method: string) => {
-        return (...params: unknown[]) => {
-          return this.call(method, ...params as any);
-        };
+        return (...params: unknown[]) => this.call(method, ...params as any);
       },
     });
     return proxy as S;
diff --git a/gui/src/pages/Guide.tsx b/gui/src/pages/Guide.tsx
index 78bfe31..0073c9e 100644
--- a/gui/src/pages/Guide.tsx
+++ b/gui/src/pages/Guide.tsx
@@ -58,7 +58,7 @@ export const Guide: React.FC = () => {
 
 
   const steps: Step[] = [{
-    title: t('登录任天堂帐号'),
+    title: t('登录Nintendo Account'),
     element: LoginNintendoAccount,
   }, {
     title: t('填写stat.ink API密钥'),
@@ -69,7 +69,7 @@ export const Guide: React.FC = () => {
   }]
 
   return <div className="full-card">
-    <Header title={t('配置向导')} />
+    <Header title={t('设置向导')} />
     <Steps className='mt-4' steps={steps} />
   </div>
 }
diff --git a/gui/src/pages/Home.tsx b/gui/src/pages/Home.tsx
index 911306d..ce0ae85 100644
--- a/gui/src/pages/Home.tsx
+++ b/gui/src/pages/Home.tsx
@@ -33,7 +33,7 @@ export const Home: React.FC = () => {
       <div className='flex flex-col gap-2'>
         <LogPanel className='sm:hidden max-h-[10rem]' />
         <RunPanel />
-        <Link to='/settings' className='btn'>{t('配置')}</Link>
+        <Link to='/settings' className='btn'>{t('设置')}</Link>
         <a className='btn' href={STAT_INK} target='_blank' rel='noreferrer'>{t('前往 stat.ink')}</a>
       </div>
     </div>
diff --git a/gui/src/pages/Settings.tsx b/gui/src/pages/Settings.tsx
index e080b6e..379e656 100644
--- a/gui/src/pages/Settings.tsx
+++ b/gui/src/pages/Settings.tsx
@@ -9,11 +9,15 @@ import classNames from 'classnames';
 import { useLogin } from 'services/s3si';
 import { STAT_INK } from 'constant';
 import { Header } from 'components/Header';
+import { useSubField } from 'hooks/useSubField';
+import { useNavigate } from 'react-router-dom';
+
+const STAT_INK_KEY_LENGTH = 43;
 
 const Page: React.FC<{ children?: React.ReactNode }> = ({ children }) => {
   const { t } = useTranslation();
   return <div className='full-card'>
-    <Header title={t('配置')} />
+    <Header title={t('设置')} />
     {children}
   </div>
 }
@@ -30,22 +34,12 @@ const Form: React.FC<{
   const { login } = useLogin();
   const { t } = useTranslation();
   const [value, setValue] = useState(oldValue);
+  const { subField } = useSubField({ value, onChange: setValue });
 
   const changed = JSON.stringify(value) !== JSON.stringify(oldValue);
 
-  const setSessionToken = (t: string) => setValue({
-    ...value,
-    profile: {
-      ...value.profile,
-      state: {
-        ...value.profile.state,
-        loginState: {
-          ...value.profile.state.loginState,
-          sessionToken: t,
-        },
-      }
-    }
-  })
+  const sessionToken = subField('profile.state.loginState.sessionToken')
+  const statInkApiKey = subField('profile.state.statInkApiKey')
 
   const [onSave, { loading, error }] = usePromiseLazy(async () => {
     await setProfile(0, value.profile);
@@ -57,9 +51,11 @@ const Form: React.FC<{
     if (!result) {
       return;
     }
-    setSessionToken(result.sessionToken);
+    sessionToken.onChange(result.sessionToken);
   })
 
+  const statInkKeyError = (statInkApiKey.value?.length ?? STAT_INK_KEY_LENGTH) !== STAT_INK_KEY_LENGTH;
+
   return <>
     <div className='card'>
       <div className="form-control w-full max-w-md mb-4">
@@ -77,8 +73,8 @@ const Form: React.FC<{
           className="input input-bordered w-full"
           type="text"
           placeholder={t('请点击右上角的登录填入') ?? undefined}
-          value={value.profile.state.loginState?.sessionToken ?? ''}
-          onChange={e => setSessionToken(e.target.value)}
+          value={sessionToken.value ?? ''}
+          onChange={e => sessionToken.onChange(e.target.value)}
         />
       </div>
       <div className="form-control w-full max-w-md mb-4">
@@ -90,24 +86,19 @@ const Form: React.FC<{
             rel='noopener noreferrer'
             href={`${STAT_INK}/profile`}
             title={t('打开 stat.ink') ?? undefined}
-          >{t('stat.ink')}</a></span>
+          >{t('查看API密钥')}</a></span>
         </label>
-        <input
-          className="input input-bordered w-full"
-          type="text"
-          placeholder={t('长度为43') ?? undefined}
-          value={value.profile.state.statInkApiKey ?? ''}
-          onChange={e => setValue({
-            ...value,
-            profile: {
-              ...value.profile,
-              state: {
-                ...value.profile.state,
-                statInkApiKey: e.target.value,
-              }
-            }
-          })}
-        />
+        <div className='tooltip' data-tip={statInkKeyError ? t('密钥的长度应该为{{length}}, 请检查', { length: STAT_INK_KEY_LENGTH }) : null}>
+          <input
+            className={classNames("input input-bordered w-full", {
+              'input-error': statInkKeyError,
+            })}
+            type="text"
+            placeholder={t('请从stat.ink中获取API密钥') ?? undefined}
+            value={statInkApiKey.value ?? ''}
+            onChange={e => statInkApiKey.onChange(e.target.value)}
+          />
+        </div>
       </div>
     </div>
     <ErrorContent error={error} />
@@ -115,7 +106,7 @@ const Form: React.FC<{
       <div className="tooltip" data-tip={changed ? undefined : t('没有更改')}>
         <button className={classNames('btn btn-primary w-full', {
           loading,
-        })} onClick={onSave} disabled={!changed}>{t('保存')}</button>
+        })} onClick={onSave} disabled={!changed || statInkKeyError}>{t('保存')}</button>
       </div>
       <button className={classNames('btn', {
         loading,
@@ -125,6 +116,7 @@ const Form: React.FC<{
 }
 
 export const Settings: React.FC = () => {
+  const navigate = useNavigate();
   let { loading, error, retry, result } = composeLoadable({
     config: usePromise(getConfig),
     profile: usePromise(() => getProfile(0)),
@@ -143,6 +135,6 @@ export const Settings: React.FC = () => {
   }
 
   return <Page>
-    {result && <Form oldValue={result} onSaved={retry} />}
+    {result && <Form oldValue={result} onSaved={() => navigate(-1)} />}
   </Page>
 }
diff --git a/gui/src/services/s3si.tsx b/gui/src/services/s3si.tsx
index 7ba9dc8..510146b 100644
--- a/gui/src/services/s3si.tsx
+++ b/gui/src/services/s3si.tsx
@@ -1,6 +1,6 @@
 import { invoke } from "@tauri-apps/api";
 import { JSONRPCClient, S3SIService, StdioTransport } from "jsonrpc";
-import { ExportOpts, Log, State } from "jsonrpc/types";
+import { ExportOpts, Log, LoggerLevel, State } from "jsonrpc/types";
 import { createContext, useCallback, useContext, useEffect, useMemo, useState } from "react";
 
 const client = new JSONRPCClient<S3SIService>({
@@ -39,6 +39,12 @@ async function getLogs() {
 }
 getLogs()
 
+export function addLog(...log: Log[]) {
+  for (const cb of LOG_SUB) {
+    cb(log);
+  }
+}
+
 const LOG_CONTEXT = createContext<{
   logs: Log[],
   renderedLogs: React.ReactNode[]
@@ -51,12 +57,26 @@ export const useLog = () => {
   return useContext(LOG_CONTEXT);
 }
 
+function renderMsg(i: any) {
+  if (i instanceof Error) {
+    return i.message
+  }
+  return String(i)
+}
+
+const DISPLAY_MAP: Record<LoggerLevel, string> = {
+  debug: 'DEBUG',
+  log: 'INFO',
+  warn: 'WARN',
+  error: 'ERROR',
+}
+
 function renderLevel(log: Log) {
-  return `[${log.level.toUpperCase()}]`.padEnd(7)
+  return `[${DISPLAY_MAP[log.level]}]`.padEnd(7)
 }
 
 function renderLog(log: Log) {
-  return `${renderLevel(log)} ${log.msg.map(String).join(' ')}`
+  return `${renderLevel(log)} ${log.msg.map(renderMsg).join(' ')}`
 }
 
 export const LogProvider: React.FC<{ limit?: number, children?: React.ReactNode }> = ({ children, limit = 10 }) => {
diff --git a/src/jsonrpc/server.ts b/src/jsonrpc/server.ts
index c290519..adc2559 100644
--- a/src/jsonrpc/server.ts
+++ b/src/jsonrpc/server.ts
@@ -75,15 +75,32 @@ export class JSONRPCServer {
     ) => Response<any, ResponseError<32000, unknown>> = (id) =>
     (
       e,
-    ) => ({
-      jsonrpc: "2.0",
-      id: id,
-      error: {
-        code: 32000,
-        message: "Internal error",
-        data: String(e),
-      },
-    });
+    ) => {
+      if (e instanceof Error) {
+        return {
+          jsonrpc: "2.0",
+          id: id,
+          error: {
+            code: 32000,
+            message: e.message,
+            data: {
+              name: e.name,
+              stack: e.stack,
+              cause: e.cause,
+            },
+          },
+        };
+      }
+      return {
+        jsonrpc: "2.0",
+        id: id,
+        error: {
+          code: 32000,
+          message: "Internal error",
+          data: String(e),
+        },
+      };
+    };
 
     // batch request
     if (Array.isArray(req)) {