symbiflow_synth fails in Yosys Techmap stage

Hello,

If this is error has been observed before, can someone please point me in the right direction ?

Thanks
Raj

make[4]: Entering directory '/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/soc/build/digilent_arty.mnv2/gateware'
symbiflow_synth -t digilent_arty -v /home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/proj/mnv2/cfu.v /home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/third_party/python/pythondata_cpu_vexriscv/pythondata_cpu_vexriscv/verilog/VexRiscv_FullCfu.v /home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/soc/build/digilent_arty.mnv2/gateware/digilent_arty.v -d artix7 -p xc7a100tcsg324-1 -x digilent_arty.xdc > /dev/null
/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/env/symbiflow/share/symbiflow/techmaps/xc7_vpr/techmap/cells_map.v:0: **ERROR: Can't find object for defparam `RAM_EXTENSION_A`!**
make[4]: *** [Makefile:34: digilent_arty.eblif] Error 1
make[4]: Leaving directory '/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/soc/build/digilent_arty.mnv2/gateware'
Traceback (most recent call last):
File "./common_soc.py", line 57, in
main()
File "./common_soc.py", line 53, in main
workflow.run()
File "/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/soc/board_specific_workflows/general.py", line 125, in run
soc_builder = self.build_soc(soc)
File "/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/soc/board_specific_workflows/digilent_arty.py", line 73, in build_soc
return super().build_soc(soc, **kwargs)
File "/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/soc/board_specific_workflows/general.py", line 102, in build_soc
soc_builder.build(run=self.args.build, **kwargs)
File "/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/third_party/python/litex/litex/soc/integration/builder.py", line 350, in build
vns = self.soc.build(build_dir=self.gateware_dir, **kwargs)
File "/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/third_party/python/litex/litex/soc/integration/soc.py", line 1147, in build
return self.platform.build(self, *args, **kwargs)
File "/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/third_party/python/litex/litex/build/xilinx/platform.py", line 73, in build
return self.toolchain.build(self, *args, **kwargs)
File "/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/third_party/python/litex/litex/build/xilinx/symbiflow.py", line 241, in build
_run_make()
File "/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/third_party/python/litex/litex/build/xilinx/symbiflow.py", line 84, in _run_make
raise OSError("Error occured during Symbiflow's script execution.")
OSError: Error occured during Symbiflow's script execution.
make[3]: *** [/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/soc/common_soc.mk:115: build/digilent_arty.mnv2/gateware/digilent_arty.bit] Error 1
make[3]: Leaving directory '/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/soc'
make[2]: *** [../proj.mk:310: prog] Error 2
make[2]: Leaving directory '/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/proj/mnv2'

The yosys version called by Symbiflow underneath is:
Yosys 0.19+18 (git sha1 08c319fc3, x86_64-conda-linux-gnu-cc 11.2.0 -fvisibility-inlines-hidden -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -fdebug-prefix-map=/home/runner/work/conda-eda/conda-eda/workdir/conda-env/conda-bld/yosys_1657668832012/work=/usr/local/src/conda/yosys-0.19_19_g08c319fc3 -fdebug-prefix-map=/home/rajsaktish/repos/all_CFU_space/synth_BG/CFU-FLOW/env/conda/envs/cfu-symbiflow=/usr/local/src/conda-prefix -fPIC -Os -fno-merge-constants)