# @forestadmin/datasource-replica fails on startup: missing cache-interface module

**URL:** <https://community.forestadmin.com/t/forestadmin-datasource-replica-fails-on-startup-missing-cache-interface-module/6564>\
**Category:** Help me!\
**Tags:** howtos\
**Created:** [August 16, 2023, 2:31pm UTC](https://community.forestadmin.com/t/forestadmin-datasource-replica-fails-on-startup-missing-cache-interface-module/6564 "2023-08-16T14:31:02Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![David\_Roegiers](https://dub1.discourse-cdn.com/flex013/user_avatar/community.forestadmin.com/david_roegiers/32/1039_2.png) [@David\_Roegiers](https://community.forestadmin.com/u/David_Roegiers)\
**Post date:** [August 16, 2023, 2:31pm UTC](https://community.forestadmin.com/t/forestadmin-datasource-replica-fails-on-startup-missing-cache-interface-module/6564/1 "2023-08-16T14:31:02Z")

</div>

## Feature(s) impacted

createReplicaDataSource

## Observed behavior

On `npm run dev`, the project crashes with

```javascript
Error: Cannot find module './cache-interface/datasource'

```

My code looks like this (I call addDataSource on server startup and pass the agent to it):

```javascript
export const addDataSource = (agent: Agent<Schema>) => {
  const stripeDataSource = createReplicaDataSource({
    pullDumpOnSchedule: ['@hourly'],
    pullDumpHandler: async () => {
      return {
        more: false,
        entries: [...(await getAllSubscriptions())],
      };
    },
  });

  const getAllSubscriptions = async () => {
    const query = 'total>1';
    let page = undefined;
    let hasMore = true;
    const entries = [];

    while (hasMore) {
      const batchedSubscriptions = await stripe.subscriptions.search({ limit: 50, query, page });
      hasMore = batchedSubscriptions.has_more;
      page = batchedSubscriptions.next_page;
      entries.push(
        ...batchedSubscriptions.data.map((s) => {
          return { record: s, collection: 'stripeSubscriptions' };
        })
      );
    }

    return entries;
  };

  agent.addDataSource(stripeDataSource);
};

```

## Expected behavior

No error and it runs.

## Failure Logs

```javascript
Error: Cannot find module './cache-interface/datasource'
Require stack:
- /Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/@forestadmin/datasource-replica/dist/index.js
- /Users/davidroegiers/Jurata/jurata-next/forest-2/external-datasources/stripe/subscriptions.ts
- /Users/davidroegiers/Jurata/jurata-next/forest-2/external-datasources/index.ts
- /Users/davidroegiers/Jurata/jurata-next/forest-2/index.ts
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:955:15)
    at Function.Module._resolveFilename.sharedData.moduleResolveFilenameHook.installedValue [as _resolveFilename] (/Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/@cspotcode/source-map-support/source-map-support.js:811:30)
    at Function.Module._load (node:internal/modules/cjs/loader:803:27)
    at Module.require (node:internal/modules/cjs/loader:1021:19)
    at require (node:internal/modules/cjs/helpers:103:18)
    at Object.<anonymous> (/Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/@forestadmin/datasource-replica/src/index.ts:7:1)
    at Module._compile (node:internal/modules/cjs/loader:1119:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1173:10)
    at Object.require.extensions.<computed> [as .js] (/Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/ts-node/src/index.ts:1608:43)
    at Module.load (node:internal/modules/cjs/loader:997:32) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    '/Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/@forestadmin/datasource-replica/dist/index.js',
    '/Users/davidroegiers/Jurata/jurata-next/forest-2/external-datasources/stripe/subscriptions.ts',
    '/Users/davidroegiers/Jurata/jurata-next/forest-2/external-datasources/index.ts',
    '/Users/davidroegiers/Jurata/jurata-next/forest-2/index.ts'
  ]
}
Waiting for the debugger to disconnect...
[nodemon] app crashed - waiting for file changes before starting...

```

## Context

- Project name: jurata-2
- Team name: jurata
- Environment name: Development
- Agent (forest package) name & version:

```javascript
  "dependencies": {
    "@forestadmin/agent": "^1.13.1",
    "@forestadmin/datasource-mongoose": "^1.4.2",
    "@forestadmin/datasource-replica": "^1.0.0",
    "axios": "^1.4.0",
    "dataloader": "^2.2.2",
    "dotenv": "^16.0.1",
    "jsonwebtoken": "^9.0.0",
    "mongoose": "^6.10.3",
    "stripe": "^12.10.0",
    "typescript": "^4.9.4"
  },

```

- Database type: external api
- Recent changes made on your end if any: it’s new code

---

<div class="post-metadata">

**Author:** ![David\_Roegiers](https://dub1.discourse-cdn.com/flex013/user_avatar/community.forestadmin.com/david_roegiers/32/1039_2.png) [@David\_Roegiers](https://community.forestadmin.com/u/David_Roegiers)\
**Post date:** [August 16, 2023, 2:42pm UTC](https://community.forestadmin.com/t/forestadmin-datasource-replica-fails-on-startup-missing-cache-interface-module/6564/2 "2023-08-16T14:42:58Z")

</div>

Some files seem to be missing in the distribution?

 ![image](https://europe1.discourse-cdn.com/flex013/uploads/forest/original/2X/f/f492c8e1005858d90b4a3fc4b06309aada9bfd07.png)

---

<div class="post-metadata">

**Author:** ![shohanr](https://dub1.discourse-cdn.com/flex013/user_avatar/community.forestadmin.com/shohanr/32/4999_2.png) [@shohanr](https://community.forestadmin.com/u/shohanr)\
**Post date:** [August 16, 2023, 2:59pm UTC](https://community.forestadmin.com/t/forestadmin-datasource-replica-fails-on-startup-missing-cache-interface-module/6564/3 "2023-08-16T14:59:24Z")

</div>

Hi @David_Roegiers ,

We found the issue. A fix should be released soon. Thanks for reaching out.

Best regards,

Shohan

---

<div class="post-metadata">

**Author:** ![morganperre](https://dub1.discourse-cdn.com/flex013/user_avatar/community.forestadmin.com/morganperre/32/1296_2.png) [@morganperre](https://community.forestadmin.com/u/morganperre)\
**Post date:** [August 16, 2023, 3:16pm UTC](https://community.forestadmin.com/t/forestadmin-datasource-replica-fails-on-startup-missing-cache-interface-module/6564/4 "2023-08-16T15:16:17Z")

</div>

Hello @David_Roegiers,

Really sorry for that and thanks for the head-up. 🙏  
We just released a new version of the `@forestadmin/datasource-replica` package. It should be good this time.

Let us know if it works for you.

Kind regards,  
Morgan

---

<div class="post-metadata">

**Author:** ![David\_Roegiers](https://dub1.discourse-cdn.com/flex013/user_avatar/community.forestadmin.com/david_roegiers/32/1039_2.png) [@David\_Roegiers](https://community.forestadmin.com/u/David_Roegiers)\
**Post date:** [August 16, 2023, 3:56pm UTC](https://community.forestadmin.com/t/forestadmin-datasource-replica-fails-on-startup-missing-cache-interface-module/6564/5 "2023-08-16T15:56:10Z")

</div>

Hi thanks,

Mh, now I get the following.

```javascript
Error: Please install sqlite3 package manually
    at ConnectionManager._loadDialectModule (/Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/sequelize/src/dialects/abstract/connection-manager.js:81:15)
    at new ConnectionManager (/Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/sequelize/src/dialects/sqlite/connection-manager.js:24:21)
    at new SqliteDialect (/Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/sequelize/src/dialects/sqlite/index.js:15:30)
    at new Sequelize (/Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/sequelize/src/sequelize.js:368:20)
    at Function.build (/Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/@forestadmin/datasource-sql/src/connection/sequelize-factory.ts:14:11)
    at connect (/Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/@forestadmin/datasource-sql/src/connection/index.ts:43:34)
    at async buildSequelizeInstance (/Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/@forestadmin/datasource-sql/src/index.ts:39:17)
    at async createSequelize (/Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/@forestadmin/datasource-replica/src/sequelize.ts:92:21)
    at async /Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/@forestadmin/datasource-replica/src/index.ts:23:24
    at async /Users/davidroegiers/Jurata/jurata-next/forest-2/node_modules/@forestadmin/datasource-customizer/src/datasource-customizer.ts:61:24
[nodemon] app crashed - waiting for file changes before starting...

```

---

<div class="post-metadata">

**Author:** ![morganperre](https://dub1.discourse-cdn.com/flex013/user_avatar/community.forestadmin.com/morganperre/32/1296_2.png) [@morganperre](https://community.forestadmin.com/u/morganperre)\
**Post date:** [August 16, 2023, 4:14pm UTC](https://community.forestadmin.com/t/forestadmin-datasource-replica-fails-on-startup-missing-cache-interface-module/6564/6 "2023-08-16T16:14:51Z")

</div>

Hello @David_Roegiers,

I will make a feedback to our team to improve the documentation.

But, this is the expected behavior, as **SQLite** is the default persistence storage strategy. You can choose another strategy or you need to add this package to your project. See more details about this in the link above. 🙂

> **[Persistent cache](https://docs.forestadmin.com/developer-guide-agents-nodejs/data-sources/custom/replication/persistent-cache)**

Regards,  
Morgan

---

<div class="post-metadata">

**Author:** ![David\_Roegiers](https://dub1.discourse-cdn.com/flex013/user_avatar/community.forestadmin.com/david_roegiers/32/1039_2.png) [@David\_Roegiers](https://community.forestadmin.com/u/David_Roegiers)\
**Post date:** [August 17, 2023, 6:35am UTC](https://community.forestadmin.com/t/forestadmin-datasource-replica-fails-on-startup-missing-cache-interface-module/6564/7 "2023-08-17T06:35:58Z")

</div>

Hello @morganperre

Ah, okay, makes sense.

Thanks for the quick fix.

Best,  
David