Error Opening Temporary File

Last night we had an error on 24x7 scheduler

An error occurred while executing automation script: Line 11: Error opening temporary file C:\Users\APCESS~1\AppData\Local\Temp\2\247C039.tmp.
2/24/2012 08:15:50:105 1 81 0 Copy of Run SAP BW Dependant Jobs if no files arri Notification Action Failed: Error opening temporary file C:\Users\APCESS~1\AppData\Local\Temp\2\247C059.tmp

Here is a copy of the JAL script and the line in red which had the error:

Dim sts, number
Dim recipients, string
Dim msg, string

// Notify administrators backup job is running.
Set recipients, "msx_dl_team_grpplanningsystems@company.com"

Set msg, "SAP BW Files not received by cutoff, running backup job"

//Send mail to recipients
MailSend( "24x7@.company.com", "", recipients, "Job @V"job_name" running", msg )

I checked the temporary directory and found the file and could open it fine. This job is not set to run "detached" so I changed it to detached and it worked fine. However if it was not detached I continued to get the same error. After stopping and starting 24x7 scheduler on the server, the job started working again and no longer created the temporary file. Can you explain the purpose of the temporary files and why they would be created.

FYI, our version of 24x7 is 3.4.33

Thanks for your help.

My guess, the process has ran out of resources or something else similar. Making the job detached (always recommended) allows the job not to share resources with the scheduler and with other jobs.
Hope that makes sense.