How do I solve the problem where I can't find variables

I created amongus mod based on the website you posted,
But I'm having problems compiling.
These errors all mean the same thing: unnamed variables

Do you know how to fix it?

such as ：
D: \ LasMonjas - main \ LasMonjas \ Patches \ PlayerControlPatch cs tobacco (1922) : error CS0246: Failed to find type or namespace name 'xxx（A variable）' (missing using directive or assembly reference?) [D:\LasMonjas-main\LasMonjas\LasMonjas.csproj]