The possible causes are:

1. During simulation or execution, when trying to make a movement defined with only one coordinate of the end point or without defining the arc radius while a "circular interpolation (G02/G03) is active.
2. During editing, when editing a circular movement (G02/G03) by defining only one coordinate of the end point or not defining the arc radius.

The solution for each cause is:

1. A "G02" or "G03" function may be programmed previously in the program history.

In this case, to make a move, both coordinates of the end point and the arc radiusmust be defined. To make a linear movement, program "G01".

1. To make a circular movement (G02/G03), both coordinates of the end point and the arc radius must be programmed.