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After an upgrade, navigating to /design and /admin shows a brief "Working" box and then only shows the background screen, and the following errors are seen in the log:
INFO [stdout] (ajp-/0.0.0.0:8009-13) com.appiancorp.process.expression.ExpressionRuntimeException$AppianExceptionProvider: Expression evaluation error : Rule 'uisubmittableform' has X parameters, but instead passed Y parameters. (APNX-1-4198-000)
where X and Y may be any number.
This occurs as a result of an improper migration.
The cause for this is that Appian is attempting to call the rules as defined in the upgraded version, however, its references to these rules are still from the pre-upgrade version.
Redo the migration, making sure to exactly follow the steps in the upgrade guide.
In particular, make sure the engines are fully shut down before you migrate them, and that all of the components being migrated are from the same timestamp.
This article applies to all versions of Appian.