Cannot resolve symbol 'cn'

As an AI language model, I need more context to provide a specific solution. However, here are some possible reasons and solutions for the error "Cannot resolve symbol 'cn'":

1. Reason: The variable or class named 'cn' is not defined in the current scope.

Solution: Check if you have declared or imported the variable or class named 'cn' in your code. If not, define or import it properly.

2. Reason: The package or library that contains the definition of 'cn' is not imported or included in your code.

Solution: Import or include the package or library that contains the definition of 'cn' in your code. For example, if 'cn' is a class from the java.sql package, you need to add "import java.sql.*;" at the beginning of your code.

3. Reason: There is a typo or misspelling in the variable or class name 'cn'.

Solution: Double-check the spelling and case of the variable or class name 'cn' in your code. Make sure it matches the actual name of the variable or class.

4. Reason: The code is not properly compiled or built, and the 'cn' symbol cannot be resolved at runtime.

Solution: Compile or build your code again, and make sure there are no errors or warnings in the build process. If the problem persists, try cleaning the project and rebuilding it from scratch.