Cannot fine name 'formSignin'

Hello can you help me to solved my problem in ionic3
i creat to create login register but i found an error at register.ts like this

source code at register.ts in the error section

We cannot see enough of the code to help you, but the indentation seems to indicate that you have the formSignIn function defined inside another function. You probably are missing some closing parentheses and/or curly brackets.