yosys crash

yosys crash

ThinkPad:2015 [master]: sby -f challenge.sby                                             
SBY 22:50:38 [challenge] Removing direcory 'challenge'.                                  
SBY 22:50:38 [challenge] Copy 'challenge.v' to 'challenge/src/challenge.v'.              
Traceback (most recent call last):                                                       
  File "/home/matt/symbiotic-20190504A-symbiotic/bin/../libexec/sby", line 388, in <module>
    retcode |= run_job(t)                                                                
  File "/home/matt/symbiotic-20190504A-symbiotic/bin/../libexec/sby", line 346, in run_job
    job.run(setupmode)                                                                   
  File "/home/matt/symbiotic-20190504A-symbiotic/bin/../libexec/../share/yosys/python3/sby_core.py", line 598, in run
    self.copy_src()                                                                      
  File "/home/matt/symbiotic-20190504A-symbiotic/bin/../libexec/../share/yosys/python3/sby_core.py", line 301, in copy_src
    copyfile(srcfile, dstfile)                                                           
  File "/home/matt/symbiotic-20190504A-symbiotic/lib/python3.6/shutil.py", line 120, in copyfile
    with open(src, 'rb') as fsrc:                                                        
FileNotFoundError: [Errno 2] No such file or directory: 'challenge.v'