RobotStudio event

What does the MultiMove error "Create Trajectories: Failed." mean?

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I am working on a MultiMove cell with two tool robots, and most of the time when I press play/calculate, i get this error: "Create Trajectories: Failed." followed by "Calculation Error". I have tried to figure out what causes the error, but with little luck. does anyone know what causes this? Also, i'd like to apologise if i have accidentally spammed this question, but nothing seemed to happen previously when i tried to submit