Please take a "snapshot" of this APPL-TOP using "AD Administration" first

Problem:

When running adpatch with "prereq" flag, we might get an error message like:
Analyzing prerequisite patch information...
AutoPatch error: This patch has some prerequisites specified, but a "snapshot" of this APPL-TOP's file-system has never been taken, thereby rendering it impossible to check for the prerequisites.
Please take a "snapshot" of this APPL-TOP using "AD Administration" first.

This error message will show up if a snapshot on current APPL_TOP doesn't exists.


Solution:

To create such snapshot on APPL_TOP:

1) run adadmin
2) Select "Maintain Applications Files menu"
3) Select "Update current view snapshot"
4) Rerun adpatch