Error occurs when generating variable fonts

I have an error when generating a variable font with Fontmake that I never had before, I don't know what it means:

`fontmake: Error: In 'sources/Arima.glyphs' -> 'master_ufo/Arima.designspace': Generating fonts from Designspace failed: ('Base master not found.', 'MarkBasePos', '[0]', 'Lookup', '[1]', 'list', '.Lookup', 'LookupList', '.LookupList', 'GPOS', '.table', 'table_G_P_O_S_')`

Static otf and ttf are correctly generated. The variable was exporting correctly before I add 2 indic scripts in the file.
Fork with source files is here : https://github.com/RosaWagner/Arima-Font