The mismatch between the license key or signature and the functional data usually means that the key or signature in the license file does not match the functional data in the software, resulting in the software not running normally. This may be due to one of the following reasons:

The 1. license file has been tampered with or damaged, so that the key or signature in it does not match the functional data in the software.

2. The key or signature in the license file does not match the functional data in the software, possibly because the license file does not match the software version, or the license file does not match the software configuration.

3. The key or signature in the license file does not match the functional data in the software, possibly because the license file has expired or is not activated.

To solve this problem, you can try the following steps:

1. Check whether the license file has been tampered with or damaged. If so, you need to obtain the license file again.

2. Ensure that the license file matches the software version and configuration.

Ensure that the license file is activated and has not expired.

If the above steps can't solve the problem, you need to contact the software vendor for more help.