An Error Has Occurred

ColdFusion could not delete the file c:\inetpub\wwwroot_labcatalog\print\temp\RML-.pdf. . The cause of this exception was: java.nio.file.FileSystemException: c:\inetpub\wwwroot_labcatalog\print\temp\RML-.pdf: The process cannot access the file because it is being used by another process.
The error occurred on line 129.