LBI Error “unable to open an advanced prompt”

When on LBI (Lawson Business Intelligence), sometimes your users may receive the following error: “The viewer is unable to open an advanced prompt dialog” when they are trying to adjust the parameters on a crystal report running through LBI (see screenshot). To resolve this error, follow the steps below.

First, navigate to the ERS install validator at https://<lbi-server>:<lbi-port>/ers/installvalidator.jsp?

Next, log in as an administrator.  On the System Settings, set “Crystalviewer Ajax” to “Enabled”.

Finally, save the install validator configuration.  The changes are instantaneous, and do not require a restart. You should no longer receive the error!