AWSS3Provider - get signed url error TypeError: Cannot read properties of undefined (reading 'byteLength')

Question

Hi, 
I have received a message that "AWSS3Provider - get signed url error TypeError: Cannot read properties of undefined (reading 'byteLength')" on my console. That means I am not able to access S3 storage by AWS Amplify SDK. I checked the user policies and roles that might be blocking my access. In addition, I received another error while login to the portal which is "{message:  "Invalid identity pool configuration. Check assigned IAM roles for this pool." :"InvalidIdentityPoolConfigurationException"}" this and receive this error while reading a file from the S3 service. so far I am having issues in terms of authentication and S3 Storage service. I have checked the multiple permission policies, configuration, and environments. There is no action that doesn't block the user access. Could you please associate me to solve that case if you know or ever experienced this issue?

![Enter image description here](/media/postImages/original/IM39mYoHOxTNOyRxgL30Z-IQ)
![Enter image description here](/media/postImages/original/IMGg-SqUICTjmh6wAJvv3EeA)

Answer

It seems like you're experiencing two issues here. The first one being related to AWS Cognito (InvalidIdentityPoolConfigurationException) and the second one related to AWS S3 (TypeError: Cannot read properties of undefined).

Here's how you can troubleshoot:

1. **InvalidIdentityPoolConfigurationException**: This error usually means that there is a problem with your Cognito Identity Pool configuration. Specifically, it can't find IAM roles that are associated with the identity pool.

Here are some steps to fix this:

- Go to the AWS Cognito Console, and then go to 'Manage Identity Pools'.
    - Find your Identity Pool and click 'Edit identity pool'.
    - In the 'Identity pool' page, check the 'Authenticated role' and 'Unauthenticated role' to ensure they have the correct permissions.

Another reason might be the 'Identity Pool ID' is incorrect. Make sure it matches the one in your AWS Amplify configuration.

2. **AWSS3Provider - get signed url error TypeError: Cannot read properties of undefined (reading 'byteLength')**: This error message is likely due to trying to access some properties of an object that is undefined.

Here are some suggestions:

- If you're trying to upload a file to S3, make sure the file object exists and it's not `undefined`. Also, ensure the file object has a `byteLength` property. This property usually exists on Buffer or ArrayBuffer objects. 
    - Ensure that you are passing the correct parameters to the 'get' method of the AWSS3Provider. The 'get' method usually requires the key of the S3 object you want to access.
    - Ensure your S3 bucket policy allows the IAM role used by the user to get the object's signed URL.

Try to debug your code and identify at what point the error occurs. It would also help to have the part of your code that gives rise to this error.

Remember to handle errors and validate input in your code to prevent such issues. For instance, before trying to access properties of an object, ensure the object is not `undefined` or `null`.

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AWSS3Provider - get signed url error TypeError: Cannot read properties of undefined (reading 'byteLength')

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