Warning: 'PyMultiNest could not be imported.'

[suvadip31]

I am getting this warning whenever I import species. The details of warnings it shows are below:

ERROR:   Could not load MultiNest library "libmultinest.so"
ERROR:   You have to build it first,
ERROR:   and point the LD_LIBRARY_PATH environment variable to it!
ERROR:   manual: http://johannesbuchner.github.com/PyMultiNest/install.html


ERROR:   Could not load MultiNest library: libmultinest.so
ERROR:   You have to build MultiNest,
ERROR:   and point the LD_LIBRARY_PATH environment variable to it!
ERROR:   manual: http://johannesbuchner.github.com/PyMultiNest/install.html

problem: libmultinest.so: cannot open shared object file: No such file or directory
/work/LAS/kerton-lab/suvadip/py3/lib/python3.8/site-packages/species/analysis/fit_model.py:26: UserWarning: PyMultiNest could not be imported.
  warnings.warn('PyMultiNest could not be imported.')

I checked and found pymultinest is already installed. Any help would be great! Thanks!

[tomasstolker]

To use PyMultiNest, it is required to manually build MultiNest. Please have a look at the instructions that you have posted in this issue.

The message is a warning though so species can still be used, apart from the functionalities that require MultiNest.

[suvadip31]

I noticed that pymultinest is already installed at /path/to/dir/lib/python3.8/site-packages/. Should I do something like below:

export LD_LIBRARY_PATH=/path/to/dir/lib/python3.8/site-packages/

[tomasstolker]

There is a difference between PyMultiNest and MultiNest. Both should be installed. You can find the installation instructions here:

https://johannesbuchner.github.io/PyMultiNest/install.html

LD_LIBRARY_PATH should point to the compiled MultiNest library.

[wbalmer]

@suvadip31 , if you're using conda for package management, you can easily install both multinest and pymultinest via conda without dealing with exporting the correct path manually.

https://anaconda.org/conda-forge/pymultinest

conda install -c conda-forge pymultinest