title: How to fix Error: SQLITE_CANTOPEN: unable to open database on Zeit.co?
body: <p>I want to connect to my database which is sqlite3. This is work fine on localhost and fail when I deployed to zeit.co with ERROR:</p>
  
  <pre><code>Error: SQLITE_CANTOPEN: unable to open database
  </code></pre>
  
  <p>As I understand, this issue is because we cannot get right path to database file. I have tried some solutions but still failed. Plz help!!!</p>
  
  <p>Here is error on zeit.co log:</p>
  
  <blockquote>
    <p>2020-02-13T07:50:40.031Z  4d5a9aed-ae26-4a09-903a-72aa08ca5140    ERROR   Unhandled Promise Rejection
      {"errorType":"Runtime.UnhandledPromiseRejection","errorMessage":"Error:
    SQLITE_CANTOPEN: unable to open database
    file","reason":{"errorType":"Error","errorMessage":"SQLITE_CANTOPEN:
    unable to open database
    file","code":"SQLITE_CANTOPEN","errno":14,"stack":["Error:
    SQLITE_CANTOPEN: unable to open database
    file"]},"promise":{"isFulfilled":false,"isRejected":true,"rejectionReason":{"errorType":"Error","errorMessage":"SQLITE_CANTOPEN:
    unable to open database
    file","code":"SQLITE_CANTOPEN","errno":14,"stack":["Error:
    SQLITE_CANTOPEN: unable to open database
    file"]}},"stack":["Runtime.UnhandledPromiseRejection: Error:
    SQLITE_CANTOPEN: unable to open database file","    at
    process. (/var/runtime/index.js:35:15)","    at
    process.emit (events.js:228:7)","    at
    eventToObjectGenerator.promiseCreated
    (/var/task/node_modules/bluebird/js/release/debuggability.js:258:33)","
    at activeFireEvent
    (/var/task/node_modules/bluebird/js/release/debuggability.js:301:44)","
    at fireRejectionEvent
    (/var/task/node_modules/bluebird/js/release/debuggability.js:703:14)","
    at Promise._notifyUnhandledRejection
    (/var/task/node_modules/bluebird/js/release/debuggability.js:90:9)"," 
    at Timeout.unhandledRejectionCheck [as _onTimeout]
    (/var/task/node_modules/bluebird/js/release/debuggability.js:39:25)","
    at listOnTimeout (internal/timers.js:531:17)","    at processTimers
    (internal/timers.js:475:7)"]} Unknown application error occurred</p>
  </blockquote>
  
  <p>Here is the code that I connect to sqlite</p>
  
  <pre><code>const fs = require('fs');
  const path = require('path');
  
  const DBSOURCE = path.join(__dirname, 'mydb.sqlite');
  
  const knex = require('knex')({
      client: 'sqlite3',
      connection: {
          filename: DBSOURCE
      }
  });
  </code></pre>
  
  <p>Note:</p>
  
  <ol>
  <li>I have tried <code>const DBSOURCE = 'mydb.sqlite'</code>;</li>
  <li>I have tried <code>const DBSOURCE = path.resolve(__dirname, 'mydb.sqlite');</code></li>
  </ol>