bonita7.3.1 MongoDBConnector

process stopped after a service task (MongoDB connector)


my process is composed of 3 steps:
1- human task: add data in a form
2- a service task with a MongoDB Connector to add data in the mongoBase
3- another human task
data are added successfully but the third step does not appear, the process is blocked in the service task.
i don't understand what is the source of the problem.
can anybody suggest me a solution?

i will be very grateful.