Error when running p4vasp on Unix system

[thienbinh92]

Hello,
I installed p4vasp on a unix system and it seemed to be fine. But when I started p4vasp by typing p4v, several errors showed. Could you please let me know what should I do in this case?
Best wishes and regards!

Traceback (most recent call last):
File "/home/m0020/m002004/p4vasp/bin/p4v.py", line 28, in
from p4vasp.SystemPM import *
File "/home/m0020/m002004/p4vasp/python-packages/p4vasp/SystemPM.py", line 130, in
import cp4vasp
File "/home/m0020/m002004/p4vasp/python-packages/cp4vasp.py", line 28, in
_cp4vasp = swig_import_helper()
File "/home/m0020/m002004/p4vasp/python-packages/cp4vasp.py", line 24, in swig_import_helper
_mod = imp.load_module('_cp4vasp', fp, pathname, description)
ImportError: libexpat.so.0: cannot open shared object file: No such file or directory

[lionping]

hi,

I just happened to read your entry. I have to add that I am neither a developer nor a user of p4vasp; I only installed it for others ;-)
As a first step you should find the file _cp4vasp.so on your system ($HOME maybe).
And then find out via ldd which libraries _cp4vasp.so was linked against.
on me, on a linuxmint19 system it looks like this:
user@host:~$ ldd /usr/lib/python2.7/dist-packages/_cp4vasp.so
linux-vdso.so.1 (0x00007ffe51b8f000)
libGLU.so.1 => /usr/lib/x86_64-linux-gnu/libGLU.so.1 (0x00007f4bcc5e1000)
libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007f4bcc355000)
libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f4bcc143000)
libXft.so.2 => /usr/lib/x86_64-linux-gnu/libXft.so.2 (0x00007f4bcbf2e000)
libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f4bcbce9000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f4bcbaca000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f4bcb8c6000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f4bcb58e000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f4bcb205000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f4bcae67000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f4bcac4f000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f4bca85e000)
libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f4bca62d000)
libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f4bca377000)
libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f4bca0c3000)
libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f4bc9eb9000)
libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f4bc9c87000)
/lib64/ld-linux-x86-64.so.2 (0x00007f4bccc60000)
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f4bc9a5f000)
libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f4bc982d000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f4bc9610000)
libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f4bc940c000)
libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f4bc9206000)
libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f4bc8ff1000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f4bc8de9000)

Check' if libexpat has been installed on your system-package and libexpat-dev-package;
myabe you need to set an LD_LIBRARY_PATH?
or, if you have already a higher version than libexpat.so.0 installed, maybe it is sufficient just to link symbolically, let's say libexpat.so.1 to libexpat.so.0 (I know it's dirty but wirth giving it a try)
well, just tried to help a bit with some suggestions...

or maybe after having installed the package libexpat-dev you need to compile the whole p4vasp once agin?
well, hope I could help at least a little bit!!
best
Michael

[lionping]

ah sorry -
the symbolic link libexpat.so.0 should point to libexpat.so.1 (just in case you wanna try this ;-) )

[orest-d]

Not sure how helpful, but here is my reflection: p4vasp does not use libexpat directly - it is probably a dependency from other libraries. If you were able to compile it, then linker could find it, though the system can't...
Did the symbolic link work?