Quartus II Internal Error

Hi,

I'm not very experienced with FPGAs. Can some one help me with the following problem please!

I did "Analysis an Elaboration" on my design and it was successful.

Then I tried "Analysis and Synthesis" and I get the following error. I guess it is related to timing and .sdc file.

Can someone give me a clue how to resolve this problem?

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Internal Error: Sub-system: SSC, File: /quartus/tsm/ssc/ssc_timing.cpp, Line: 93 !use_relaxed_slacks || (tdc_edge_slacks != 0)

Stack Trace:

0xf460: SSC_UTIL::compute_average_lut_delay + 0xed0

0x10b77: SSC_UTIL::perform_timing_analysis + 0x467

0x342ce: sutil_ssc_perform_timing_analysis + 0x1be

0x68b6f: MAP_TESLA::set_lut_cost + 0x400f

0x670e0: MAP_TESLA::set_lut_cost + 0x2580

0x26d7e: FTM_ROOT_IMPL::lutmap + 0x54e

0x24392: FTM_ROOT_IMPL::start_normal_flow + 0x152

0x23909: FTM_ROOT_IMPL::start + 0x149

0x23008: FTM_ROOT::start + 0x128

0x604a3: scl_start + 0x5ab83

0x6101d: scl_start + 0x5b6fd

0x65113: scl_start + 0x5f7f3

0x2ebb5: scl_start + 0x29295

0x2f7b7: scl_start + 0x29e97

0x2fcff: scl_start + 0x2a3df

0x5435: scl_run_parallel_mls_script + 0xf95

0x11fad: qexe_get_command_line + 0x1b7d

0x14e0e: qexe_process_cmdline_arguments + 0x59e

0x14f21: qexe_standard_main + 0xa1

0x4ae8: msg_exe_fini + 0x58

0x522c: msg_exe_fini + 0x79c

0x1524: MEM_SEGMENT_INTERNAL::~MEM_SEGMENT_INTERNAL + 0x194

0x5e0f: msg_exe_main + 0x8f

0x159bc: BaseThreadInitThunk + 0xc

0x2a2e0: RtlUserThreadStart + 0x20

End-trace

Quartus II 64-Bit Version 13.0.0 Build 156 04/24/2013 SJ Web Edition