DRAFT KB-XXXX - Cannot view or navigate to sites on iOS mobile app

Symptoms

When using the iOS Appian mobile application, users who have their start page as a site see the error:
```
The site does not exist, or you do not have sufficient privileges to access it.
```

Users who have their start page as Tempo cannot see other site options when using the left navigation bar. However, these site options are visible on desktop and mobile browsers.

In tomcat-stdOut.log, the following error is observed:

com.appiancorp.core.expr.exceptions.ExpressionRuntimeException$AppianExceptionWithRootCauseProvider: Expression evaluation error: Error is in the title expression for page with web address identifier *****

Cause

This occurs due to an expression evaluation error in the Title field of a site page, causing the mobile bootstrap call to fail to present all sites.

This issue has been reported to the Appian Product Team with reference number AN-128510.

Action

Locate the affected Site page by searching for the web address identifier (denoted by ***** in the log snippet above) in all Site objects. For example, if the web address identifier in the logs is admin, then the Site page's Web Address Identifier field will also be admin. The Title field expression for this Site page needs to be edited to evaluate correctly in order to resolve this issue:

example_of_site

Affected Versions

This article applies to all versions of Appian.

Last Reviewed: August 2020