Please find some errors during the license activation:
The error message displayed on the device varies depending on the cause of the license activation failure.
l The message "Error: The filename is invalid, and the postfix of the file name must be 'dat'." is displayed.
This message indicates that the file name extension of the license file to be activated is incorrect. The license file name extension must be .dat. Activate a correct license file.
l The message "Error: The specified file does not exist or is illegal." is displayed.
Ensure that the license file exists or a correct file name is entered.
l The message "Info: License File expired." is displayed.
The license file has expired. Apply for or purchase a new license.
l The message "Info: License file validation failed." is displayed.
The license file has failed the validation. Apply for or purchase a new license.
l The message "No product features present in LK." is displayed.
The license file mismatches the product information. Apply for or purchase a new license.
l The message "Info: License File with ESN or Version mismatch cannot be activated repetitively." is displayed.
The ESN has been activated before or version mismatch has occurred. Apply for or purchase a new license.
l The message "Info: No product features present in license file." is displayed.
The control items in the license file only include quotation items for basic software. The license file is installed before delivery and does not need to be activated.
l If the fault cannot be rectified, collect error information and contact technical support.
I hope that it is helpful 
