dashboard error when active I modulate contract

Hello, I’m new to the forum. I installed dolibarr yesterday on my windows machine. Everything working perfectly. However, when I activated the contract generation module, there was an error in the dashboard. Can someone help me?

NOTE: if I disable the contract module, it will reappear.

Fatal error: Uncaught Error: Class ‘Product’ not found in C: \ dolibarr \ www \ dolibarr \ htdocs \ core \ boxes \ box_services_contracts.php: 89 Stack trace: # 0 C: \ dolibarr \ www \ dolibarr \ htdocs \ core \ class \ html.formother.class.php (1200): box_services_contracts-> loadBox (5) # 1 C: \ dolibarr \ www \ dolibarr \ htdocs \ index.php (80): FormOther :: getBoxesArea (Object (User) , ‘0’) # 2 {main} thrown in C: \ dolibarr \ www \ dolibarr \ htdocs \ core \ boxes \ box_services_contracts.php on line 89