Symbiflow_synth : "-- Parsing counter.v' using frontend -vlog2k' -- ERROR: Can't open input file `counter.v' for reading: No such file or directory

[YCin]

Hi
When i try to test the example counter_test of X-ray project inside the board Artix7 35tcsg324-1 i have the following error
-- Parsing counter.v' using frontend -vlog2k' --
ERROR: Can't open input file `counter.v' for reading: No such file or directory

are there any one have suggestions fro this problem.

Thanks

[YCin]

symbiflow_write_bitstream -d artix7 -f top.fasm -p xc7a35tcpg236-1 -b example.bit
Writing bitstream ...
Traceback (most recent call last):
File "/home/gg/opt/f4pga/xc7/conda/envs/xc7/bin/xcfasm", line 8, in
sys.exit(main())
File "/home/gg/opt/f4pga/xc7/conda/envs/xc7/lib/python3.7/site-packages/xc_fasm/xc_fasm.py", line 63, in main
emit_pudc_b_pullup=args.emit_pudc_b_pullup)
File "/home/gg/opt/f4pga/xc7/conda/envs/xc7/lib/python3.7/site-packages/xc_fasm/fasm2frames.py", line 186, in fasm2frames
assembler.parse_fasm_filename(filename_in, extra_features=extra_features)
File "/home/gg/opt/f4pga/xc7/conda/envs/xc7/lib/python3.7/site-packages/prjxray/fasm_assembler.py", line 183, in parse_fasm_filename
for line in fasm.parse_fasm_filename(filename):
File "/home/gg/opt/f4pga/xc7/conda/envs/xc7/lib/python3.7/site-packages/fasm/parser/antlr.py", line 115, in parse_fasm_filename
raise error[0]
Exception: Parse error at 0:0 - Couldn't open file