Qsys Error: Failed to elaborate classic module C:/Users/.../yysystem.ptf

Hello,

i didn't touch my project for a while.

Now i get the error:

Error: Failed to elaborate classic module C:/Users/.../AppData/Local/Temp/alt7407_3755802541581721576.dir/0007_sopclgen/yysystem.ptf (254)

In other topics they told to close qsys, quartus and reboot the system but that all didn't help.

I only changed some c and h files on my NIOSII code (nothing related to the qsys)

Is maybe the quartus installation corrupt? If maybe yes, how to reinstall it preferably (install over the old, remove reinstall)?

Quartus II 64Bit 12.1 SP1 installed

Below the last messages of th Generate log before the error occurs:

Info: Starting classic module elaboration.
      1  sh (6408) C:\altera\12.1sp1\quartus\bin\cygwin\bin\sh.exe: *** fatal error - cygheap base mismatch detected - 0xE708D0/0x612708D0.
This problem is probably due to using incompatible versions of the cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.  Rebooting is also suggested if you
are unable to find another cygwin DLL.
      0  sh 5140 fork: child -1 - forked process 6408 died unexpectedly, retry 0, exit code -1073741819, errno 11
C:/altera/12.1sp1/quartus/sopc_builder/bin/nios_sh: fork: retry: Resource temporarily unavailable
      2  sh (6756) C:\altera\12.1sp1\quartus\bin\cygwin\bin\sh.exe: *** fatal error - cygheap base mismatch detected - 0xE708D0/0x612708D0.
This problem is probably due to using incompatible versions of the cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.  Rebooting is also suggested if you
are unable to find another cygwin DLL.
1090043  sh 5140 fork: child -1 - forked process 6756 died unexpectedly, retry 0, exit code -1073741819, errno 11
C:/altera/12.1sp1/quartus/sopc_builder/bin/nios_sh: fork: retry: Resource temporarily unavailable
      1  sh (1376) C:\altera\12.1sp1\quartus\bin\cygwin\bin\sh.exe: *** fatal error - cygheap base mismatch detected - 0xE708D0/0x612708D0.
This problem is probably due to using incompatible versions of the cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.  Rebooting is also suggested if you
are unable to find another cygwin DLL.
3170757  sh 5140 fork: child -1 - forked process 1376 died unexpectedly, retry 0, exit code -1073741819, errno 11
C:/altera/12.1sp1/quartus/sopc_builder/bin/nios_sh: fork: retry: Resource temporarily unavailable
      2  sh (3976) C:\altera\12.1sp1\quartus\bin\cygwin\bin\sh.exe: *** fatal error - cygheap base mismatch detected - 0xE708D0/0x612708D0.
This problem is probably due to using incompatible versions of the cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.  Rebooting is also suggested if you
are unable to find another cygwin DLL.
7258297  sh 5140 fork: child -1 - forked process 3976 died unexpectedly, retry 0, exit code -1073741819, errno 11
C:/altera/12.1sp1/quartus/sopc_builder/bin/nios_sh: fork: retry: Resource temporarily unavailable
      3  sh (776) C:\altera\12.1sp1\quartus\bin\cygwin\bin\sh.exe: *** fatal error - cygheap base mismatch detected - 0xE708D0/0x612708D0.
This problem is probably due to using incompatible versions of the cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.  Rebooting is also suggested if you
are unable to find another cygwin DLL.
15338349  sh 5140 fork: child -1 - forked process 776 died unexpectedly, retry 0, exit code -1073741819, errno 11
C:/altera/12.1sp1/quartus/sopc_builder/bin/nios_sh: fork: Resource temporarily unavailable
Error: Failed to elaborate classic module C:/Users/ith/AppData/Local/Temp/alt7407_3755802541581721576.dir/0022_sopclgen/yysystem.ptf (254)
Info: Finished elaborating classic module.