Error logging into Field Sheet app after installing service pack 21 for 2018.1

Unable to log into Field Sheet app after installing service pack 21 for 2018.1

Error begins with:

Error loading reference data

One or more errors occurred.

Client found response content type of ‘test/html; charset=utf-8’, but expected ‘text/xml’.

• Tyler EAM
• Version 2018.1.21.0

IIS configurations were incorrect

Relaunch the MIU