DDR2 fitter error in quartus 9.1

[Altera_Forum]

i am getting the below error when i try to run fitter, my design uses DDR2 controller 

  Error: Too Few items in collection (0) for list write_clock_id  while executing "error "Too Few items in collection ($i) for list $vlist""  (procedure "sett_collection" line 14)  invoked from within "sett_collection write_clock_id [get_pins -compatibility_mode $write_clock_pattern]"  (procedure "add_requirements_for_instance" line 378)  invoked from within "add_requirements_for_instance $corename $inst t board ISI $ddr2_sdram_data_phy_use_flexible_timing"  ("foreach" body line 3)  invoked from within "foreach inst $instance_list {  post_sdc_message info "Adding SDC requirements for $corename instance $inst"  add_requirements_for_instance $corename $..."  (file "ddr2_sdram_data_phy_ddr_timing.sdc" line 653)

[Altera_Forum]

I'm getting the same error... do you have the answer? 

 Thanks

[Altera_Forum]

no i am not able to remove the error in quartus 9.1, insted i used subscribtion edition(30 day free) to compile my ddr2 deisgn in arria ii. 

 bhupesh

[Altera_Forum]

I remember seeing a similar error. Try copying the following TCL files into the build directory(Where the QPF file is located). 

<Project name>_phy_autodetectedpins.tcl <Project name>_Controller_phy_ddr_pins.tcl <Project name>_Controller_phy_ddr_timing.tcl <Project name>_Controller_phy_report_timing_core.tcl  I think this will get rid of the errors.  Kumaran