I keep getting this error out of the blue many compile, no problem then bam.



Code:
Stopping web application: DAPCON
Generating .wso files for web application: DAPCON
- C:\TUFware\Development\WindowsApplications\DAPCON\AppHtml\WebServiceDispatcher.wso
----Compiling WebApp.src----
- Compiling Program: C:\TUFware\Development\WindowsApplications\DAPCON\AppSrc\WebApp.src
- LINK ERROR: UNABLE TO OPEN OUTPUT FILE C:\TUFware\Development\WindowsApplications\DAPCON\Programs\WebApp.exe, FILE MAY BE IN USE OR READ-ONLY
- Summary
- Memory Available: 2147483646
- Total Warnings : 0
- Total Errors   : 1
- Total Symbols  : 2
- Total Resources: 0
- Total Commands : 0
- Total Windows  : 0
- Total Pages    : 0
- Static Data    : 0
- Message area   : 0
- Total Blocks   : 3
- 1 ERRORS HAVE BEEN FOUND.
----Compile Finished (With Errors!)----
----Compiler Error Summary----
- LINK ERROR: UNABLE TO OPEN OUTPUT FILE C:\TUFware\Development\WindowsApplications\DAPCON\Programs\WebApp.exe, FILE MAY BE IN USE OR READ-ONLY

I have to reboot, there is no rhyme nor reason to when it happens