Query of Queries Suddenly Stopped Working

[EssexJohn]

I have pages that have been working for months which use the query of queries
feature in Coldfusion. They've suddenly just stopped working. All report the
same error message -

Error Executing Database Query.

null

The error occurred in
C:\WebSites\IMAP\IMAP\modules\receiving\action\act _Purchase_History.cfm: line 62
Called from C:\WebSites\IMAP\IMAP\modules\receiving\index.cfm: line 63
Called from C:\WebSites\IMAP\IMAP\htdocs\receiving.cfm: line 8
Called from
C:\WebSites\IMAP\IMAP\modules\receiving\action\act _Purchase_History.cfm: line 62
Called from C:\WebSites\IMAP\IMAP\modules\receiving\index.cfm: line 63
Called from C:\WebSites\IMAP\IMAP\htdocs\receiving.cfm: line 8

60 :
61 : <!--- Combined History query --->
62 : <cfquery name="Purchase_History" dbtype="query">
63 : SELECT Deal_List.T_Deal_Header_ID, Deal_List.Purchase_Date,
Deal_List.Goods_ETA_Date,
64 : Vendor_List.strCompanyName, Deal_List.tblPREmployee_ID,
Deal_List.Total_Deal_Cost,

Here is the top four lines of the stack trace -

java.sql.SQLException
at coldfusion.sql.JdbcImpl.getConnection(Unknown Source)
at coldfusion.sql.JdbcImpl.getConnection(Unknown Source)
at coldfusion.sql.SqlImpl.execute(Unknown Source)
at coldfusion.tagext.sql.QueryTag.doEndTag(Unknown Source)

Any ideas why the query of queries feature would just stop working? I was
hoping this was a known problem with a known answer. I'm re-writing pages as
fast as I can to query the database but the application is used to run our
company and is HUGE.

Thanks

[EssexJohn]

By the way, this is Coldufsion 6.0, not 6.1. We never switched to 6.1 because we found out some pages would have to modified to work and just haven't taken the time to do it yet.