Problem with build project in NIOS2

I am facing problem to build my project using NIOS 2.

My OS is win7 and the NIOS 2 version is 9.1

When I build my project, I keep receiving this fatal error message.

ake -s all includes

5 [main] ? (5652) c:\altera\91\quartus\bin\cygwin\bin\sh.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x7A0000, top 0x7B0000, reserve_size 61440, allocsize 65536, page_const 4096

3 [main] sh 5884 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

/bin/sh: fork: Resource temporarily unavailable

make: *** No rule to make target `/bin/gtf/generated_app.mk.gtf', needed by `/cygdrive/c/altera/Project/NiosIIlab1/hello_world_0/hello_world_0_syslib/Debug/system_description/../obj/generated_app.mk-t'. Stop.

Another repeated error message is like this

5 [main] ? (5476) c:\altera\91\quartus\bin\cygwin\bin\sh.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x680000, top 0x690000, reserve_size 61440, allocsize 65536, page_const 4096

3 [main] sh 4628 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

/bin/sh: fork: Resource temporarily unavailable

I am not sure what is the cause of this problem. I have tried to turn off my antivirus software but the problem persists.. I have tried so many times to rebuild my project but the problem is still there....

Can anyone help with this??