The possible causes are:

1. When editing an axis coordinate after the cutting conditions (F, S, T or D) or the "M" functions.
2. When the marks of the block skip (conditional block /1, /2 or /3) are not at the beginning of the block.
3. When programming a block number greater than 99999999 while programming in ISO code.
4. When trying to define the coordinates of the machining starting point in the finishing operation (G68) of the "Irregular pocket canned cycle".
5. While programming in high-level, the value of the RPT instruction exceeds 9999.

The solution for each cause is:

1. Remember the programming order.2. Remember the programming order.

 Block skip (conditional block /1, /2 or /3).

 Label (N). "G" functions. Axis coordinates. (X, Y, Z…). Machining conditions (F, S, T, D). "M" functions.

1. Correct the syntax of the block. Program the labels between 0 and 99999999.
2. No point can be programmed within the definition of the finishing cycle (G68) for the "Irregular pocket canned cycle". The CNC selects the point where it will start machining. The programming format is: G68 B...L...Q...I...R...K...V...

And then the cutting conditions.

1. Correct the syntax of the block. Program a number of repetitions between 0 and 9999