An agent created a temporary file but was unable to delete it.
Agents sometimes creates temporary files, often as response files containing command line arguments. This warning triggers when an agent fails to delete such a file.
Probably something changed between the time when the agent created the temporary file and the time that same agent tried to delete it. For example, a build step may have altered the permissions of the file or its containing directory.
If filesystem permissions changed, either eliminate that change or find a different place to locate the temporary file. If the temporary file must be relocated but its location is not under user control, then contact product support.