Xpath evaluation:type mismatch The second parameter to be the selected() function must be in quotes(like ‘1’)

Pliss, help.
My KoboCollect have warning error:

Xpath evaluation:type mismatch
The second parameter to be the selected() function must be in quotes(like ‘1’)

My script:
Scripting Commuterline - Copy.xlsx (58.4 KB)

How i should be??

@Apry, do you also get the error message with Enketo? Is this an issue only with a single device or do you get the error message even on other devices?