Hello, I'm trying to use the Inkscape text extension, but it gives this error:

Traceback (most recent call last):
  File "text_uppercase.py", line 12, in <module>
    Uppercase().run()
  File "/snap/inkscape/8049/share/inkscape/extensions/inkex/base.py", line 140, in run
    self.save_raw(self.effect())
  File "/snap/inkscape/8049/share/inkscape/extensions/inkex/extensions.py", line 315, in effect
    for elem in nodes.values():
AttributeError: 'odict_values' object has no attribute 'values'

I also can't add gradient to images, and tried to add the print marks (which I use a lot) and returned this:

Traceback (most recent call last):
  File "printing_marks.py", line 401, in <module>
    PrintingMarks().run()
  File "/snap/inkscape/8049/share/inkscape/extensions/inkex/base.py", line 140, in run
    self.save_raw(self.effect())
  File "printing_marks.py", line 290, in effect
    g_center = layer.add(inkex.Group(**g_attribs))
  File "src/lxml/classlookup.pxi", line 77, in lxml.etree.ElementBase.__init__
  File "src/lxml/apihelpers.pxi", line 158, in lxml.etree._initNewElement
  File "src/lxml/apihelpers.pxi", line 317, in lxml.etree._initNodeAttributes
  File "src/lxml/apihelpers.pxi", line 333, in lxml.etree._addAttributeToNode
  File "src/lxml/apihelpers.pxi", line 1744, in lxml.etree._attributeValidOrRaise
ValueError: Invalid attribute name 'inkscape:label'

what can it be?

Thank you for your help!!

Note, i'm using the 1.0.1 inkscape version

Describe your OS & version, the installer you used, plus any special hardware like tablet/stylus or multiple monitors.

My system is Ubuntu 20.4, I added inkscape 1.0.1 ppa, then I installed it directly in the ubuntu store, I use a dell notebook with an additional monitor, but the problem appears in both the monitor and the notebook

Thanks for attention!

I'm not well versed in Linux, but it looks like the install was via a "snap" package. 

I would uninstall Inkscape and re-install following the directions here: https://inkscape.org/release/inkscape-1.0.2/gnulinux/ubuntu/ppa/dl/

Chime back and let us know how that goes.

I installed inkscape according to the link tutorial, but I still see this error and code when I try to use the uppercase and lowercase extension

/usr/lib/python3/dist-packages/apport/report.py:13: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
  import fnmatch, glob, traceback, errno, sys, atexit, locale, imp, stat
Traceback (most recent call last):
  File "text_uppercase.py", line 12, in <module>
    Uppercase().run()
  File "/usr/share/inkscape/extensions/inkex/base.py", line 140, in run
    self.save_raw(self.effect())
  File "/usr/share/inkscape/extensions/inkex/extensions.py", line 315, in effect
    for elem in nodes.values():
AttributeError: 'odict_values' object has no attribute 'values'

It shows this message as well: inkscape received additional data from the executed script. the script did not return any errors, but this may indicate that the result will not be as expected

Thank you, that seems to be an improvement. 

Version 1.0.2 had some fixes added a few hours ago... I'd try an uninstall/reinstall again, maybe the fix will be included.

If not, there is a way to install just the extensions.