was not registered for synchronization because synchronization is not active

This error message usually appears in a multi-threaded application when attempting to access a resource that has not been properly initialized for synchronization.

To resolve this issue, you should first check if synchronization is enabled and active in your application. If it is not, you should enable it and ensure that all resources that require synchronization are properly initialized with appropriate synchronization primitives, such as locks or semaphores.

If synchronization is already enabled and active, you may need to review your code to ensure that all threads are properly synchronized when accessing shared resources. It is also possible that there is a bug in your code that is causing this error, in which case you should debug and fix the issue accordingly.