# V064. Unable to run a rule to analyze a code fragment.

This error indicates that the analyzer failed to analyze a code fragment using the specified diagnostic rule.

This issue may be due to an incomplete model built by the analyzer. In this case, delete the `.PVS-Studio/models` directory (located in the project directory), then restart the analysis. If the problem persists please contact our support team and attach text files from the `.PVS-Studio` directory so that we can fix this error as soon as possible.

To get more information about the issue, enable the `verbose` mode as described in the documentation for the V061 diagnostic rule.