Woocommerce integration kit does not activate the protected workbook

I'm using the current version of Woocommerce integration Kit, but it's impossible to activate the protected workbook. I get this error:



I dont know what is the reason of this error, the previous version of the kit works perfectly.

Checking logs I got this information:

[2025-11-22T01:35:45.523223+00:00] xls-padlock.DEBUG: WP_PATH defined as: /home/customer/www/alternativasfiscales.com/public_html/ [] {"uid":"e6c0fed"}
[2025-11-22T01:35:45.523576+00:00] xls-padlock.CRITICAL: Error: this script cannot be called directly. [] {"uid":"e6c0fed"}