When creating a base view from a Distributed File System data source, the error “Error accessing DFS file: Status code: -1 error code: null” might occur due to invalid file ‘Path’ or ‘File name pattern’.
To troubleshoot this issue, you could perform the following checks:
1. Ensure that the ADLSv2 data source was created using the latest ‘**Denodo Distributed File System Wrapper**’ downloaded from the Downloads -> DenodoConnects -> DenodoConnect Open downloads section of [Denodo Support Site](https://support.denodo.com/resources/denodo-connect/list/Denodo%208.0).
1. Verify if the ‘**Path**’ and ‘**File name pattern**’ values in the ‘Edit Wrapper Parameter values’ window is valid. For instance, ensure to use the escape character ‘\’ in case the file name pattern contains a special character.
1. Verify if the file(s) have the correct **permissions** to be accessed by the user account used for authentication.
1. Check the **vdp.log file** under ‘<DENODO_HOME>/logs/vdp’ for detailed log entries that would help debug the issue further.
You could take a look at [Denodo Distributed File System Custom Wrapper - User Manual](https://community.denodo.com/docs/html/document/denodoconnects/8.0/en/Denodo%20Distributed%20File%20System%20Custom%20Wrapper%20-%20User%20Manual#h.chn0t2880adq) for more information.
If you still need help and if you are a valid Support user, please create a Support case at [Denodo Support Site](https://support.denodo.com/) so that our Team will help you further.
Hope this helps!