Symptoms

Suppose you have a button with a rule configured to navigate to URL when button is clicked. In this URL base URL defined as environment field is being used. When button is clicked, warning message appears:
Invalid location specified
The following location might be invalid. Continue to “”%URL%”. Yes/No.
If “Yes” button is clicked navigation continues without any issues.
 

Diagnoses

In such cases, you should verify correctness of the environment field value, paying attention to protocol and port portions of it.
 

Resolution

Normally this can be resolved by using proper and correct value for environment field being used in URL. It may be the case that overall URL is normal but port number, for example, is omitted.