“OutOfMemoryException” error while scanning private application

Hello,
When I tried to scan a private application, unexpectedly it showed the following error:
ERROR [Crawler:RequestManagerThread.ThreadProc[62]] SPI.Scanners.Web.Audit.Auditor in startSessionDrivenAuditThread, exception thrown:
System.Threading.ThreadStartException: Thread failed to start. —> System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.
— End of inner exception stack trace —
at System.Threading.Thread.StartInternal(IPrincipal principal, StackCrawlMark& stackMark)
at System.Threading.Thread.Start()
at SPI.Scanners.Web.ThreadUtil.StartThread(ManualResetEvent threadIsRunningEvent, Thread& thread, ThreadStart threadStart, String threadName)
at SPI.Scanners.Web.Audit.Auditor.u()
And the tool got closed. Need your help to solve this.
Thanks.
