Please help us help you and fill where relevant:
Your LimeSurvey version: Version 5.6.14
Own server or LimeSurvey hosting:
Survey theme/template:
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Hi everyone,

I downloaded the survey structure in .txt to make changes in Excel.

Now, when importing the updated .txt file, an error is occurring.
I can import the file, but when trying to open the survey the following error appears:

500: Internal Server Error
Selected Surveys language not found
An internal error occurred while the Web server was processing your request.
Please contact Administrator to report this problem.

(I've already tried deleting the id and related_id columns as discussed in other questions here on the forum)

Thank you in advance.

txt file:
 

Please, send the original lss export.
Maybe we can reproduce your steps and find out.

Joffm

Of course, attached the .lss file.

Thank you!

 

I import the txt file with success after deleting the 2 2st column.

Only issue with some utf8
 


Please : give it a try.
(You can use LibreOffice calc for real TSV editor)

PS : if it work : please report this as an issue on TSV edition.