[Trac] SubTicket not working in 1.5.3

Hi,

I want to migrate a few projects from a Trac server (1.2.2), to another 
Trac (1.5.3), I have managed to migrate them, but the problems come with 
the plugins, especially with the SubTicket plugin, which is giving me this 
error:

ERROR: Skipping “tracsubtickets.web_ui = tracsubtickets.web_ui”: 
ImportError: cannot import name 'ITemplateStreamFilter' from 'trac.web.api' 
(/usr/lib/python3/dist-packages/trac/web/api.py).

From what I have investigated, the problem is that in the new versions of 
trac, the ITemplateStreamFilter element does not exist.

What is the solution to this problem? By the way, downgrading is not an 
option.

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