Error generating SOPC Builder system after C2H acceleration

Hello all,

I have a problem using the NIOS II C2H Compiler.

I tryed to accelerate a function by right-click its name and selecting "Accelerate ...."

Then I selected the items "Build software, generate SOPC Builder system, and run Quartus II compilation" and "Use hardware accelerator in place of software implementation. Flush data cache before each call"

However, when I click "Build project" I get the following error:

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Error: Can't create file C:/Workspace/BB_DVBC/FEC_NIOS.ptf

Error: System generation failed.

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If I click "Build project" again, I get the following message ....

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**** Build of configuration Debug for project BB_DVBC_sw ****

make -s all includes

Creating generated_app.mk...

12.11.2009 12:46:22 - (SCHWERWIEGEND) generate: java.lang.IllegalStateException: java.lang.IllegalStateException: java.io.FileNotFoundException: c:\Workspace\BB_DVBC\software\BB_DVBC_sw_syslib\..\..\FEC_NIOS.ptf (Zugriff verweigert)

make: *** [/cygdrive/c/Workspace/BB_DVBC/software/BB_DVBC_sw_syslib/Debug/system_description/../obj/generated_app.mk-t] Error 1

Build completed in 2.75 seconds

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If I try to regenerate the SOPC Builder system using the SOPC Builder I get the same error as the first one ("Cant create file .... .ptf") and I have to use a backup to restore my files.

so apparently the ptf file is corrupted after the generation in the NIOS IDE...

does anyone have a solution or an idea what could be the problem ??

thanks in advance !