Reg process start form

A Score Level 1

Hi All,

I have placed an interface in process start form and calling that process model in another interface by a!startprocess() inside  a! buttonwidget ()

I am not able to see the interface when i i click the button which is  inside the process start form

But in moniter page i am able to see the process model is triggered

If i open the instance it is showing unknown error 

Any idea on this 

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