Error with dynamic variable

<CFOUTPUT query="q_ProjectNumbers">
  <CFSET 'TotalProject_#ProjectNumber#' = 0>
</CFOUTPUT>

<CFOUTPUT query="q_employeeNames"><CFSET TotalBillable = 0>
              <tr>
                <td>#q_employeeNames.employeeName#</td>
                 <CFLOOP list="#plist#" index="pid">
                       <CFQUERY name="q_ProjectsWorkedOn" datasource="MMIAppDB">
                        SELECT sum(BillableHours) AS Billable, ProjectNumber, EmployeeName
                        FROM Timesheet
                        WHERE EmployeeName = '#q_employeeNames.EmployeeName#' AND ProjectNumber = '#pid#' AND Date BETWEEN #createODBCdate(DateRange.Start)# AND #createODBCdate(DateRange.End)#
                        GROUP BY ProjectNumber, EmployeeName
                       </CFQUERY>
                       <td><CFIF q_projectsWorkedOn.billable is "">&nbsp;<CFELSE>#q_projectsWorkedOn.billable# <CFSET TotalBillable = (TotalBillable + q_projectsWorkedOn.billable)><CFSET 'TotalProject_#pid#' = 'TotalProject_#pid#' + q_projectsWorkedOn.billable></CFIF></td>
                 </CFLOOP>
              <td>#TotalBillable# <CFSET TotalTotal = (TotalTotal + TotalBillable)><td></tr>
            </CFOUTPUT>

Error:


The value "TotalProject_445" cannot be converted to a number  

The Error Occurred in C:\Inetpub\wwwroot\resourceadmin\viewtimesheet.cfm: line 68
 
66 :                         GROUP BY ProjectNumber, EmployeeName
67 :                        </CFQUERY>
68 :                        <td><CFIF q_projectsWorkedOn.billable is "">&nbsp;<CFELSE>#q_projectsWorkedOn.billable# <CFSET TotalBillable = (TotalBillable + q_projectsWorkedOn.billable)><CFSET 'TotalProject_#pid#' = 'TotalProject_#pid#' + q_projectsWorkedOn.billable></CFIF></td>
69 :                  </CFLOOP>
70 :               <td>#TotalBillable# <CFSET TotalTotal = (TotalTotal + TotalBillable)><td></tr>

 
Max_DavisAsked:
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danrosenthalCommented:
looks like the error is with this line:
<CFSET 'TotalProject_#pid#' = 'TotalProject_#pid#' + q_projectsWorkedOn.billable>

change it to this:
<CFSET 'TotalProject_#pid#' = evaluate('TotalProject_'&pid) + q_projectsWorkedOn.billable>
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Max_DavisAuthor Commented:
Thank you
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