Undeclared identifier when it is obviously declared

I have a code like the snippet below:

Undeclared identifier when it is obviously declared

I have a code like the snippet below:

Undeclared identifier when it is obviously declared

I have a code like the snippet below:

Undeclared identifier when it is obviously declared

I have a code like the snippet below:

Undeclared identifier when it is obviously declared

I have a code like the snippet below: