Generation's problem

Hello,

Does somebody know about this problem?

# 2005.07.05 12:12:17 mk_custom_sdk: WARNING

#

# did not find class.ptf for altera_nios2 "cpu_0"

#

# 2005.07.05 12:12:17 (*) (Legacy SDK Generation Skipped)

# 2005.07.05 12:12:17 (*) (All TCL Script Generation Skipped)

# 2005.07.05 12:12:17 (*) (No Libraries Built)

# 2005.07.05 12:12:17 (*) (Contents Generation Skipped)

# 2005.07.05 12:12:17 (*) mk_custom_sdk finishing

# 2005.07.05 12:12:17 (*) Starting generation for system: System_Top.

ERROR:

Error: Bad or corrupt 'class.ptf' file for module cpu_0

Required PTF section:

'CLASS'

was not found in PTF section/file:

' '

Error in processing. System NOT successfully generated.