Unknown Property Error in Salesforce VisualForce Page

In Visualforce, getter and setter are mandatory to reference variables from the custom controller or extension apex class.
 
1. Declare the variable with public scope.

2. User getter and setter.

Sample code:
 
public class ClassName() {

     public String strVar { get; set; }

    public ClassName() {

       strVar = 'Default Value';

    }

}

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