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I don't know why this error, the power rating of the belt is 0 and in red
You might want to increase the size of the pulley, this seems to be the first error, this should then solve the second error.
The size of the small pulley i cannot increase since we manufacture them since long ago in this size and it works.
But the size error is written with only the letters in red, do you think this is a crucial error? i mean can it prevent from calculating?