version-mismatch.txt
My project uses <stack>. On my machine it works; on <host> I get:
<paste the error>

Check whether this is a version difference:
- How to see the exact runtime and extension versions on both machines.
- Which features in my code need a newer version than the host might have.
- Extensions my code needs that the host may not have enabled.
- How to pin the version I develop against so this can't happen again.

Then tell me whether to change my code or change the host's setting.

Develop on the version the host runs, not the newest one. Being told a feature doesn't exist is a much better way to find out than a blank page in production.