Install_code actor class leads to error "empty input" and "too few arguments"

Took me more than a night of sleep :wink:.

Yes indeed @levi was correct, it needed a candid-parameter to update the code of the canister because my canister constructor takes a parameter, the user principal.

That solved this question but then I had to encode the parameters. This was solved today in my following question: Encode Principal to Candid arguments - #10 by peterparker