The Federation Service encountered an error while loading the trust policy. The trust policy field '%1' was set to an unacceptable ...

The Federation Service encountered an error while loading the trust policy. The trust policy field '%1' was set to an unacceptable value. The field must contain a valid Uniform Resource Identifier (URI). 
Field: %1 
Value: %2 

If this error occurs during startup of the Federation Service, the Federation Service will be not be able to start, and all requests to the Federation Service will fail until the configuration is corrected. If this error occurs while the Federation Service is running, the Federation Service will continue to use the last trust policy that was loaded successfully. 

User Action 
Correct the '%1' field by configuring it with a valid URI value. 

Additional Data 
UriFormatException message: %3