DRAFT KB-XXXX "A side by side layout has an invalid item." error when accessing applications and objects in /design

Symptoms

Users receive the following error when attempting to access an application or object in /design:

The following error is observed in the application server log:

ERROR com.appiancorp.rest.shared.AppianExceptionMapper - Internal Server Error on REST API invocation.
com.appiancorp.exceptions.LocalizedAppianRuntimeException$LocalizedAppianException: Expression evaluation error : A side by side layout has an invalid item. The item at index 2 contains a component that is not supported in a side by side layout. Received: <X>.

Cause

Asdf

Action

Restart the application server.

Affected Versions

This article applies to all versions of Appian.

Last Reviewed: November 2018