# ID 120407

Unknown channel block.
Description | The received movement command (channel block) is not valid in the actual state of the tool radius compensation. In the selected condition of TGC there are only linear motion blocks permitted.
Response | Class | 2 | Abort NC program.
Solution | Class | 3 | Check de-/selection of TGC.
Parameter | %1: | NC block number [-]
| Internal state of tool geometry compensation
Error type | 1, Error message from NC program.