When opening a python project (running kdevelop-latest appimage), kdevelop immediately crashes with the following output on the console:

Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element
Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element
Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 78: saw unknown, expected number
kdevplatform.serialization: version-hint not found, seems to be an old version
kdevplatform.serialization: "The data-repository at /home/FF/vernjaff/.cache/kdevduchain/kdevelop-{a85793ea-501d-4c92-ba22-f3e74f5568a6} has to be cleared."
QSqlDatabase: QSQLITE driver not loaded
QSqlDatabase: available drivers: 
Couldn't setup QtHelp Collection file
qrc:/qml/main.qml:21:1: module "QtQuick" is not installed
welcomepage errors: (qrc:/qml/main.qml:21:1: module "QtQuick" is not installed)
Ninja plugin installed but ninja is not installed.
Could not load plugin "KDevNinjaBuilder" , it reported the error: "" Disabling the plugin now.
Ninja plugin installed but ninja is not installed.
Could not load plugin "KDevNinjaBuilder" , it reported the error: "" Disabling the plugin now.
trying to load "/tmp/.mount_IGxm2h/usr/lib/qt5/plugins/kf5/kio/file.so" from "/tmp/.mount_IGxm2h/usr/lib/qt5/plugins/kf5/kio/file.so"
trying to load "/tmp/.mount_IGxm2h/usr/lib/qt5/plugins/kf5/kio/file.so" from "/tmp/.mount_IGxm2h/usr/lib/qt5/plugins/kf5/kio/file.so"
inotify_add_watch("/home/FF/vernjaff/zdroj/brython-misc/data/repos/git/repositories") failed: "Permission denied"
 ====> PARSING ====> parsing file  QUrl("file:///home/FF/vernjaff/zdroj/brython-misc/virtual_env/lib/python3.4/site-packages/setuptools/tests/test_test.py") ; has priority 10000
 ====> AST     ====>     building abstract syntax tree for  "/home/FF/vernjaff/zdroj/brython-misc/virtual_env/lib/python3.4/site-packages/setuptools/tests/test_test.py"
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Fatal Python error: Py_Initialize: Unable to get the locale encoding
ImportError: No module named 'encodings'

Current thread 0x00007fd9228d6700 (most recent call first):
/tmp/.mount_IGxm2h/AppRun: line 28: 28919 Aborted                 (core dumped) kdevelop $@


Reproducible: Always




The reporter of bug #361896 run into a similar problem but Sven Brauch could not figure out what is wrong. Since that bug was originally about something else I am opening a new bug to note that I am also affected. I am more than happy to try to help pinpoint what the problem is though I am as clueless as Sven Brauch :-)