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

[dougaspen]

Yes on the 2.58.
Unfortunately, no saving different files along the way.

What I can’t understand is that if I completely delete everything in the designer,that it still does not work.

[ABG]

@dougaspen

I started a new app just to make sure there wasnt some other issue and that works ok.

Could you export the bad project to an .aia file and post that here for analysis?

[dougaspen]

Here it is.MicroSplit.aia (202.2 KB)

[TIMAI2]

Loaded it up, deleted everything, and it still generated the error message on refresh when connected to companion (this on a linux system with genymotion emulator). Odd.

MicroSplit_empty.aia (1.1 KB)

[Svetlana_GREGOIRE]

Hello,

I have the same problem and i fix it.

1.export the bad project
2 create a copy
3. rename your bad project to a *.zip and open the zip, open src/appinventor… to the end. you have 2 files, if you have one screen (Screen1.scm and Screen1.bky) extract Screen1.scm and open it with notepad++
4. there is a line code in the beginning like that :
{“authURL”:[“ai2.appinventor.mit.edu”],“YaVersion”:“205”,“Source”:“Form”,“Properties”:{"$Name":“Screen1”,"$Type":“Form”,"$Version":“27”,“AppName”:“PlaniF”,“Column”:“3”,“PrimaryColor”:"&HFF000000",“Row”:“0”,“Scrollable”:“True”,“ShowListsAsJson”:“False”,“Title”:“PlaniF”,“Uuid”:“0”,“VersionName”:“1.01”,"$Components"…
5. remove “Column”:“3” and “Row”:“0” with ,
6 save the file, replace it on your *.zip
7 rename your *.zip to a *.aia
8 import your project.
that’s all

[TIMAI2]

Only Column:0 in the original aia

[Svetlana_GREGOIRE]

you can make ti with the copy if you want

[TIMAI2]

Just tested by removing Column:0 and Row:0 from the scm file, and it seems to have solved it. Well done @Svetlana_GREGOIRE

[Svetlana_GREGOIRE]

[Svetlana_GREGOIRE]

MicroSplit_copy.aia (202.2 KB)

your working file

[ABG]

So the question is, how did Column and Row get into Screen1 attributes?

[TIMAI2]

Must have been put there by some component. Other question is, if that component was removed, why didn’t it take the column and row with it !! ?

[dougaspen]

You guys rock.

Thank you very much!!!

[HHH]

hello i have the same problem i will be happy if you helpfirebasedemo.aia (41.1 KB)

[TIMAI2]

@HHH

hello i have the same problem

Did you try the workaround from @Svetlana_GREGOIRE

[HHH]

hi i tried to do but i couldn’t I would be glad if you help

[TIMAI2]

Your issue was in your second screen

firebasedemo_revised.aia (41.1 KB)

[Anke]

@HHH

i tried to do but i couldn’t I would be glad if you help

See also here for a simplified solution:

How to get rid of this error message "no method named Column in class edu.mit.appinventor"

export aia open it with 7-Zip or winRAR go to the affected ScreenX.scm: right mouse click: “Edit” (or: F4) remove “Column”:“X” and “Row”:“Y” close Editor & 7-Zip / winRAR No need to copy or rename anything. See the solution from @Svetlana_GREGOIRE : Newbie here...need a little help invoke: no method named `Column' in class edu.mit.appinventor

[ewpatton]

We have released nb183c, which will remove the errant Column and Row properties from Screens if they are present.