Forgive me if this isn't the correct forum for this query but I'm totally bewildered with vast number to choose from.
Anyway.
I do a lot of CAD work with F360 and TurboCAD, and am dipping my toes into the mysterious waters of CNC. To that end I've purchased the miniature Benbox 1310 engraver, and installed the Universal Gcode Sender.

I downloaded the spiral.gcode program from GitHUb and am having problems getting it to run.

It's only 14 lines long and terminates with the following rather uninformative error message.

[Error] An error was detected while sending 'G3X0Y0I20J0': Error: Invalid gcode ID:33. Streaming has been paused.

Since this appears to be the first command in a program stated to be a test program I'm totally flumaxed.

Here's the complete program.

G21 (Units in millimeters)
G90 (Absolute programming)
G17 (XY plane)
F900

G3 X0 Y0 I20 J0
G3 X0 Y0 z 20 I20 J0
G3 X0 Y0 I20 J0

G1 Z0
G2 X0 Y0 I-20 J0
G2 X0 Y0 z -20 I-20 J0
G2 X0 Y0 I-20 J0
G1 Z0

I'm lost. Please help.