RobotStudio event

Fault - Could not activate all tasks

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Hi!

I'm trying to use an action instruction that does: SETDO a signal. I get this fault:

irb260_Eri: T_ROB1 does not have any entry point 2006-09-19 14:11:51 
irb260_Eri: Could not activate all tasks 2006-09-19 14:11:51 

The signal is an own signal that I created in "Panel". Is it ok to do that or which signals can u use?