Based on the error message "[CUSTOM WRAPPER][ERROR]", it looks like this error is coming from the custom wrapper. In this case, I will check the following settings:
1. Configuration parameters of the custom wrapper to crate a data source, such as File system URI, Access Key ID etc, is correct or not
2. Wrapper Parameter values for creating Base View from the data source, such as Parquet File path etc, is correct or not
And then, execute the count query again and check if there are any error messages.
I found the relevant info in the following document. I believe it should be helpful to you.
* [How to integrate Amazon S3 with Denodo Distributed File System Custom Wrapper](https://community.denodo.com/kb/view/document/How%20to%20integrate%20Amazon%20S3%20with%20Denodo%20Distributed%20File%20System%20Custom%20Wrapper?category=Data+Sources)
If the issue persists and you are a valid support user, you may open a **Support Case** at the [Denodo Support Site](https://support.denodo.com/) and Support Team will help you.
Hope this helps!