How fetch formKey in TaskListener using delegateTask

Camunda 7 Topics
1

I am trying to fetch formKey in TaskListener implemeted class -
TaskEntity taskEntity = (TaskEntity) delegateTask;

taskEntity.getFormKey()

but getting blow error

The form key / form reference is not initialized. You must call initializeFormKeys() on the task query before you can retrieve the form key or the form reference.