Call to a member function addEagerConstraints on null

This error typically occurs when trying to execute a method on a null object. In this case, it seems that you are trying to call the "addEagerConstraints()" method on a null object.

To fix this error, you need to ensure that the object you are trying to call the method on is not null. Check your code for any instances where you may have assigned a null value to the object or where the object may not have been initialized properly.

Alternatively, it is possible that the method you are trying to call may not be available in the current context. Double-check that the method exists and that it is accessible from the current scope.

If you are still unable to resolve the error, try providing more context or sharing the relevant code snippet so that we can better assist you