> Documentation index: [Saleor](/llms.txt) · [This section](/developer/llms.txt)
> Source: https://docs.saleor.io/developer/extending/apps/developing-apps/troubleshooting

Find solutions to common issues that you may face during app development.

# Issues

<a id="i-see-typescript-errors"></a>

## I see Typescript errors

Saleor [Apps](https://github.com/saleor/apps), [SDK](https://github.com/saleor/saleor-app-sdk) and [App Template](https://github.com/saleor/saleor-app-template/discussions) use [pnpm](https://pnpm.io/) package manager. It can be sensitive to dependencies resolutions, especially in a monorepo setup.

Please ensure you have installed the right version of pnpm on your machine and re-install dependencies with `pnpm install`.

To find the accurate pnpm version in your project, check the root `package.json` file and look for the `packageManager` field.

For example: `"packageManager": "pnpm@8.2.0"` means that you need to install exactly the `8.2.0` version of pnpm.

<a id="client-side-graphql-requests-are-rejected-due-to-cors-error"></a>

## Client-side GraphQL requests are rejected due to CORS error

If you are using the Saleor Cloud instance, you may encounter the following error when trying to make a GraphQL request from the client side:

```text
Access to fetch at 'https://xxx.eu.saleor.cloud/' from origin 'https://your-application' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
```

The issue might be caused by the CORS policy set up in the Saleor Cloud dashboard. Navigate to the environment details of your instance and check the `Allowed API origins` section. If option `Selected origins` is selected, you have two possible solutions:

-   Add your application URL to the list of allowed origins.
-   Ensure your application makes GraphQL requests from the server side only.

<a id="inspecting-webhook-delivery"></a>

## Inspecting webhook delivery

You can query app logs to see webhooks' delivery attempts.

```graphql
{
  apps(first:2){
    edges{
      node{
        type
        identifier
        webhooks{
          eventDeliveries(first:10){
            edges{
              node{
                attempts(first:10){
                  edges{
                    node{
                      responseStatusCode
                      response
                      responseHeaders
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}
```

Alternatively, you can also see a log of webhook deliveries in the `Dashboard -> Apps -> Your app -> Manage App` section.

note

If your subscription requires permissions that are not granted to your app, delivery attempts will not be included in the results of this query.