When applying an Oracle Critical Patch Update (CPU) package, you receive an error:
"INFO:Command invocation returned Error... 'Access is denied.', Return Code = 1"
The error occurs when the CPU process tries and fails to back up files from a previous patch. This could be due to inadequate file system permissions to the %ORACLE_HOME%\.patch_storage folder, or to the presence of another previously existing backup for the same patch.
To resolve this error, check the following: