Why can't I send my work in progress?

My contribution works in the IDE, why can’t I send it as work in progress? I get an error with my solution:
“Answer.ts(1,5): error TS2304: Cannot find name ‘A’.”

You can click “test in IDE” and develop your solution by the same way as in other puzzles.

All tests are positve in the IDE, do I just have to copy and paste from there then?