Can anyone help me know how to correct this bug please:

2017-03-22 09:09:01,114 4354 ERROR openerp openerp.http: Exception during JSON request handling.
Traceback (most recent call last):
  File "/opt/openerp/openerp/http.py", line 544, in _handle_exception    return super(JsonRequest, self)._handle_exception(exception)  File "/opt/openerp/openerp/http.py", line 581, in dispatch    result = self._call_function(**self.params)  File "/opt/openerp/openerp/http.py", line 317, in _call_function    return checked_call(self.db, *args, **kwargs)  File "/opt/openerp/openerp/service/model.py", line 154, in wrapper    raise openerp.osv.orm.except_orm(_('Integrity Error'), msg)except_orm: ('Integrity Error', 'The operation cannot be completed, probably due to the following:\n- deletion: you may be trying to delete a record while other records still reference it\n- creation/update: a mandatory field is not correctly set\n\n[object with reference: prix_commission - prix.commission]')