Trac 1.4 incompatiblity

[anonymous]

The plugin cannot be installed in Trac 1.4, it crashes the application with error in log

2019-10-08 15:34:15,658 Trac[main] ERROR: Internal Server Error: <RequestWithSession "GET '/wiki/Home'">, referrer redacted

Traceback (most recent call last):

File "/var/lib/trac/trac14/lib/python2.7/site-packages/Trac-1.4-py2.7.egg/trac/web/main.py", line 639, in dispatch_request

dispatcher.dispatch(req)

File "/var/lib/trac/trac14/lib/python2.7/site-packages/Trac-1.4-py2.7.egg/trac/web/main.py", line 271, in dispatch

method=method)

File "/var/lib/trac/trac14/lib/python2.7/site-packages/Trac-1.4-py2.7.egg/trac/web/chrome.py", line 1441, in render_template

fragment, iterable, method)

File "/var/lib/trac/trac14/lib/python2.7/site-packages/Trac-1.4-py2.7.egg/trac/web/chrome.py", line 1516, in _render_jinja_template

page = self.render_template_string(template, data, text)

File "/var/lib/trac/trac14/lib/python2.7/site-packages/Trac-1.4-py2.7.egg/trac/web/chrome.py", line 1675, in render_template_string

string = template.render(data)

File "/var/lib/trac/trac14/lib/python2.7/site-packages/Jinja2-2.10.3-py2.7.egg/jinja2/environment.py", line 1008, in render

return self.environment.handle_exception(exc_info, True)

File "/var/lib/trac/trac14/lib/python2.7/site-packages/Jinja2-2.10.3-py2.7.egg/jinja2/environment.py", line 780, in handle_exception

reraise(exc_type, exc_value, tb)

File "/var/lib/trac/trac14/lib/python2.7/site-packages/Trac-1.4-py2.7.egg/trac/wiki/templates/wiki_view.html", line 11, in top-level template code

# extends 'layout.html'

File "/var/lib/trac/trac14/lib/python2.7/site-packages/Trac-1.4-py2.7.egg/trac/templates/layout.html", line 12, in top-level template code

# import "macros.html" as jmacros with context

File "/var/lib/trac/BikeTrackLogger/.egg-cache/BlueFlatTheme-1.0.1-py2.7.egg-tmp/blueflattheme/templates/blueflat_theme.html", line 12, in top-level template code

${select('*|comment()|text()')}

UndefinedError: 'select' is undefined