What does the error "Cannot invoke 'java.security.KeyStore.size()' because 'this.myKeyStore' is null" mean while using Intellij Idea?

edit

This error means that you are trying to invoke the method size() on an object (myKeyStore) that has not been initialized with a value. In other words, myKeyStore is currently null, and you cannot call a method on a null object.

To resolve this error, you need to initialize myKeyStore with a valid value before trying to call any of its methods.