Thank you for the additional search suggestion but that still didn't lead to an answer to my problem as far as I could find. I know what I'm supposed to be doing in the game, it's just the game won't let me do so. It's a renpy error.
Note for small, defenseless users who first appeared on an adult forum without supervision. Which is not a good adult users do not respond.
Step one.
Use the search on the topic. We type in the search for "Crab fight error" (for example)
Step two
This is a miracle, someone has already written about this and even answered what to do.
Step three
If you could read the answer - you are the winner.
Congratulations, you are now one step closer to growing up.
Not to be unfounded here are a couple of posts.
#8,836
#8,837
And everything else, look for yourself ...
And yes there may be a bug, but you can get around it