Article credit: Sage 

The following error may appear when opening the AR or AP Enquiry screen:

SOLUTION:

Delete the relevant agent registry key on the local PC where the above is a problem, as follow:
a) Completely close Evolution on the specific PC where this problem occurs on;
b) Open the PC’s Registry by going to Start | Run (or the text field just on top of the Start button),
insert the text: regedit and Enter on the keyboard;

For a Windows 8 PC, on the desktop of the PC, select the Windows key on the keyboard together with R on the keyboard to open the screen below, enter regedit below and enter on the keyboard to open the Registry Editor

c) In the Registry Editor, go to:
• For AR Enquiries screen:
HKEY_CURRENT_USER\Software\Softline\Evolution\Agents\*XXX*\ TfrmAREnquiries
• For AP Enquiries screen:
HKEY_CURRENT_USER\Software\Softline\Evolution\Agents\*XXX*\ TfrmAPEnquiries
d) Right click on the TfrmAREnquiries / TfrmAPEnquiries folder and then delete it
e) Repeat the same step on any other folder with a very similar name e.g. TfrmAPEnquiries002
f) Log back into the company with that same agent on the same PC and test if the query has now
been resolved.
g) If not, close Evolution again on the local PC and delete the complete agent in the local PC’s
Registry e.g. HKEY_CURRENT_USER\Software\Softline\Evolution\Agents\*XXX*
h) Again Log back into the company with that same agent on the same PC and test if the query has
now been resolved.
*XXX* above depends on the specific relevant agent name that encounters the problem on
that specific PC.