Easygui 0.98 easygui.fileopenbox causes Traceback

[BOrnellas]

Today I had tried calling a script I had written that previously had no issues using the easygui.fileopenbox method, however when I ran the script today I got the following error:
File "", line 1, in
File "/usr/local/lib/python2.7/dist-packages/easygui/boxes/demo.py", line 142, in easygui_demo
demo_reply = chosen_demo()
File "/usr/local/lib/python2.7/dist-packages/easygui/boxes/demo.py", line 455, in demo_fileopenbox
f = fileopenbox(msg, title, default=default)
File "/usr/local/lib/python2.7/dist-packages/easygui/boxes/fileopen_box.py", line 103, in fileopenbox
func = ut.tk_FileDialog.askopenfilenames if multiple else ut.tk_FileDialog.askopenfilename
AttributeError: 'module' object has no attribute 'askopenfilename'

Using Python 2.7.6 on Linux Mint 17.3.
Are there updated dependencies required for using the release version of easygui 0.98?
Thank you

[GenericError]

According to the README, there are no required dependencies. Have you still got the script which causes this issue or is the error still reproducible?