This is known as a low-effort post. You’ve done bare minimum possible here and even the title is misspelt and doesn’t give the full error.
Please use code-tags when posting code and spend some time explaining what is going wrong. Report errors in full, not just the bits you consider important. 99% of the time these errors are typos/syntax errors which always give you both the line and column they are found on. A quick Google search explains the error too.
If you don’t understand C# then please also state that too because as I said above, these are often simple typos or basic syntax issues.