run_mp filed

Dear developer,

When I use the command (reacnetgenerator --type bond -i bonds.reaxc -a C H --nohmm), the following error occurs, I don't know what is TypeError.I would appreciate it if you could tell me the solution. thank you very mush.

```
2024-04-12 13:15:14,161 - ReacNetGenerator 1.6.12 - ERROR: run_mp failed
multiprocessing.pool.RemoteTraceback:
"""
Traceback (most recent call last):
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/multiprocessing/pool.py", line 121, in worker
result = (True, func(*args, **kwds))
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/multiprocessing/pool.py", line 44, in mapstar
return list(map(*args))
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/reacnetgenerator/_detect.py", line 255, in _readstepfunc
molecules = self._connectmolecule(bond, level)
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/reacnetgenerator/_detect.py", line 188, in _connectmolecule
mols, bondlists = dps(bond, level)
File "reacnetgenerator/dps.pyx", line 55, in reacnetgenerator.dps.dps
TypeError: zip argument #1 must support iteration
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/reacnetgenerator/utils.py", line 559, in run_mp
for item in results:
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/tqdm/std.py", line 1181, in __iter__
for obj in iterable:
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/multiprocessing/pool.py", line 354, in
return (item for chunk in result for item in chunk)
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/multiprocessing/pool.py", line 748, in next
raise value
TypeError: zip argument #1 must support iteration
multiprocessing.pool.RemoteTraceback:
"""
Traceback (most recent call last):
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/multiprocessing/pool.py", line 121, in worker
result = (True, func(*args, **kwds))
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/multiprocessing/pool.py", line 44, in mapstar
return list(map(*args))
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/reacnetgenerator/_detect.py", line 255, in _readstepfunc
molecules = self._connectmolecule(bond, level)
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/reacnetgenerator/_detect.py", line 188, in _connectmolecule
mols, bondlists = dps(bond, level)
File "reacnetgenerator/dps.pyx", line 55, in reacnetgenerator.dps.dps
TypeError: zip argument #1 must support iteration
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/bin/reacnetgenerator", line 8, in
sys.exit(_commandline())
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/reacnetgenerator/commandline.py", line 160, in _commandline
cell=args.cell,
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/reacnetgenerator/reacnetgen.py", line 270, in runanddraw
self._process(processthing)
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/reacnetgenerator/reacnetgen.py", line 337, in _process
_Detect.gettype(self).detect()
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/reacnetgenerator/_detect.py", line 132, in detect
self._readinputfile()
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/reacnetgenerator/_detect.py", line 152, in _readinputfile
for molecules, (step, thetimestep) in results:
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/reacnetgenerator/utils.py", line 559, in run_mp
for item in results:
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/site-packages/tqdm/std.py", line 1181, in __iter__
for obj in iterable:
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/multiprocessing/pool.py", line 354, in
return (item for chunk in result for item in chunk)
File "/work/home/ac0gjfyzpa/software/anaconda3/envs/ReacNetGenerator/lib/python3.7/multiprocessing/pool.py", line 748, in next
raise value
TypeError: zip argument #1 must support iteration
```