raise OSError("no file with expected extension") in runnning DMRG from PySCF

[Nellatur]

Hi,

I tried to use block from pyscf in windows subsystem linux. I did

1. download binary versions of block1.5 (both serial and parallel, I only want to use the serial at this stage）from
   https://sanshar.github.io/Block/build.html
2. cp both serial and parallel versions into the same directory and extract them
3. installed boost 1.5 by
   sudo apt-get purge libboost-all-dev
sudo apt-get install libboost1.55-all
   up to this stage, ./block.spin_adapted-1.5.3-serial -v gives me version and copyright information.

and by https://github.com/sanshar/Block/blob/master/README_Examples/FCIDUMP
and https://github.com/sanshar/Block/blob/master/README_Examples/1/input.dat at the same directory as the binary files,
with ./block.spin_adapted-1.5.3-serial input.dat the program starts to work :)

4. installed new version of pyscf by
   pip install pyscf
pip install --upgrade pyscf
pip install git+https://github.com/pyscf/dmrgscf
5. created settings.py in .../pyscf/dmrgscf by
   BLOCKEXE = "/path/to/Block/block.spin_adapted" <- I have changed to the directory of block.spin_adapted-1.5.3 and block.spin_adapted-1.5.3-serial
BLOCKEXE_COMPRESS_NEVPT = "/path/to/serially/compiled/Block/block.spin_adapted" <- I have changed to the directory of block.spin_adapted-1.5.3 and block.spin_adapted-1.5.3-serial
BLOCKSCRATCHDIR = "/path/to/scratch" <- have set to a directory
   MPIPREFIX = "mpirun"
6. created a test2.py as
   from pyscf import gto, scf, dmrgscf
mf = gto.M(atom='C 0 0 0; C 0 0 1', basis='ccpvdz').apply(scf.RHF).run()
mc = dmrgscf.dmrgci.DMRGSCF(mf, 6, 6)
mc.run()
7. python test2.py, it led to

Traceback (most recent call last):
File "test2.py", line 1, in <module>
from pyscf import gto, scf, dmrgscf
File "/home/username/anaconda3/lib/python3.7/site-packages/pyscf/dmrgscf/__init__.py", line 106, in <module>
from pyscf.dmrgscf import dmrgci
File "/home/username/anaconda3/lib/python3.7/site-packages/pyscf/dmrgscf/dmrgci.py", line 41, in <module>
libunpack = lib.load_library('libicmpspt')
File "/home/username/anaconda3/lib/python3.7/site-packages/pyscf/lib/misc.py", line 68, in load_library
return numpy.ctypeslib.load_library(libname, _loaderpath)
File "/home/username/anaconda3/lib/python3.7/site-packages/numpy/ctypeslib.py", line 155, in load_library
raise OSError("no file with expected extension")

I am wondering where I made the mistake? I don't think I have configurated openmpi, since I would like to run with a single core.