using gateways, it is important to validate if there exists an option to
continue with the flow of the process. If no condition is met to
advance with the flow, Bizagi will display an error to indicate that
there is no valid transition to continue.
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a user tries to complete a task, the process flow cannot continue and
the following error is displayed:
Unable to process the case:
There are not valid transition to go for task (id:[IdTask]).
error is caused when the process flow arrives to a gateway and none of
the conditions is met to continue with the process instance.
the conditions configured in the gateway to determine whether the
gateway is satisfying all the possible values.
the other hand, you can use the option Else (when no other option is
valid) to avoid that process flow gets stuck.