I am getting the following 2 errors every so often.

1.
Procedure Utilosfprintserver001.zgetpo
C:\ecnc\source\utilosfprintserver.sct (line 15)
"Nesting error."
2.
Procedure Utilosfprintserver001.zgetpo
C:\ecnc\source\utilosfprintserver.sct (line 7)
"Error reading file \\stysinger3\osf\data\orders.dbf."

Create Cursor notprinted (po c(30))
If File('\\stysinger3\osf\data\orders.dbf')
	If Not Used('orders')
		Use '\\stysinger3\osf\data\orders.dbf' In 0 Shared
	Endif
	Select orders
	Scan For Len(Alltrim(orders.po))>0 And orders.printed<>.T.
		Select notprinted
		Locate For Alltrim(notprinted.po)=Alltrim(orders.po)
		If Found()=.T.
			*do nothing
		Else
			Insert Into notprinted (po) Values (orders.po)
		Endif
	Endscan
	Thisform.lstpos.RowSource='notprinted.po'
	Thisform.lstpos.Refresh
	Thisform.lstpos.Click
	Thisform.Refresh
Else
	Wait 'network path not found, process suspeneded' Window Nowait
Endif

This bit of code is part of an automated process that fires every 10 seconds or 30000 miliseconds.
Any ideas on what is causing these errors?