When editing cache configuration, I try to put some invalid value, for example on "Transactions" tab into "Stop timeout" field, when I put a string "xyz", which is trivially invalid since it's not a number, I get an error dialog with text:
"domain-failure-description
WFLYCTL0097: Wrong type for stop-timeout. Expected [LONG] but was STRING"

The text is very descriptive, which is fine. I would suggest removing the "domain-failure-description" string and maybe even the WildFly error code, to make it more user friendly.