Can you please confirm the following points?
1. Are you getting the correct output PDF?
2. Are you not calling any code other than Word to PDF and still the errors are logged?
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Yes we are getting the correct output file.
The issue is under investigation. We will update you soon.
storageService.File.CopyFile(PathToFileConverted, PathToFileConverted, asposeStorageName);
The source and destination parameters in CopyFile method point to same location and name so copying the file to same name and location does not make sense as the file is already present there. Using CopyFile in this case is not recommended as it is wasting resources.
Regarding the exception in your logs, can you please share which values you passed to ConvertDocument method when CopyFile produced error?