This means that an arc (G2/G3) has a smaller radius than the radius of the tool, this includes tool compensation in case it is active. 
It is physically not possible to make a move like that and therefore returns an error.

Error BNC700001 "CNC Software already running on this computer"

Error "Tool radius not less than arc radius with compensation"

default_ip

Warning "Machine axes are not homed - limits are not active

Common questions

[Public] Common questions

Warning "G21/G20 used but configuration specifies.."

Warning "Macro does not specify unit"

Error "Add ZHC point not on GRID"

Error / warning messages

Run code at the end of a job

Use a DXF/DWG/SVG/STEP/STL file

Rename an input/output

Apply configuration to a new installation

Restore the configuration to an earlier state

Disable feed rate / speed override

Set feed rate / speed override to a value at beginning of a job

Configure homing if an axis does not require homing or is homed manually

Add a macro button to Operate view

Get more inputs/outputs

Run macro by using wireless pendant

Start a job by triggering a hardware input?

Trigger an action other than through the user interface, with an input

CPU5A and LaserEngrave mode command that switches the laser on/off during motion