My app crash but i dont know why, no method named Column

[Taifun]

@sams_sams

no method named Column’ in class appinventor.ai_samsvr75.robot.Screen1

See here

Newbie here...need a little help invoke: no method named `Column' in class edu.mit.appinventor

I keep getting this message " invoke: no method named `Column’ in class edu.mit.appinventor" I have tried eliminating all blocks thinking the problem was there but to no avail. Any help is greatly appreciated.

Taifun