Known Problems¶
The following sections detail the known problems with PEGS
along with recommended solutions, where they exist.
Installation problems¶
Runtime problems¶
“numpy.dtype size changed”¶
Errors about numpy.dtype size changed, may indicate binary incompatibility:
it’s recommended to reinstall the scipy package using the
--no-binary option of pip, i.e.:
pip uninstall scipy
pip install --no-binary scipy scipy==1.1.0
See https://stackoverflow.com/a/25753627/579925 for more details.
“ERROR: Package ‘setuptools’ requires a different Python: 2.7.12 not in ‘>=3.5’”¶
This error has been observed when using Python 2.7 and installing
PEGS using virtualenv as described in the
installation documentation:
ERROR: Package 'setuptools' requires a different Python: 2.7.12 not in '>=3.5'
This appears to be a problem with the virtualenv initialisation
pulling in a version of the setuptools package which is not
compatible with Python 2.7.
In this case it’s recommended to try the following procedure to set up the Python virtual environment:
virtualenv --no-setuptools -p python2.7 venv.pegs
source venv.pegs/bin/activate
pip install setuptools
which should then have the correct version of setuptools.
PEGS can then be installed using e.g.:
pip install pegs-0.3.0.tgz
as before.
“RuntimeError: Python is not installed as a framework” (Mac OS X)¶
Under Mac OS X PEGS may appear to install without any issues but
then fail at runtime with an error like:
RuntimeError: Python is not installed as a framework. The Mac OS X
backend will not be able to function correctly if Python is not
installed as a framework. See the Python documentation for more
information on installing Python as a framework on Mac OS X. Please
either reinstall Python as a framework, or try one of the other
backends. If you are using (Ana)Conda please install python.app and
replace the use of 'python' with 'pythonw'. See 'Working with
Matplotlib on OSX' in the Matplotlib FAQ for more information.
This message is preceeded by errors coming from the matplotlib
Python library.
A workaround for this problem is to use a combination of conda
and pip:
conda create -n pegs python=3.6 matplotlib=2.2.3
conda activate pegs
pip install pegs-0.3.0.tgz
Essentially this uses a conda environment instead of a Python
virtualenv.
If you are not familiar with conda then see:
Instructions for installing conda on Mac OS are available
here: