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The error seems to be raised because your token has 32 characters, but the regex only expects up to 20. Try to change the regex to:
r'^activate/(?P<uidb64>[0-9A-Za-z_\-]+)/(?P<token>[0-9A-Za-z]{1,13}-[0-9A-Za-z]{1,32})/$'
# Change to 32 ^^
Source:stackexchange.com