Bad Authentication data error code 215 when trying to fetch rss data



I’m using wordpres plugin which displays my latest twits. And the problem is that from few days i can not find a fix to fetch data from my twitter account, it happend before but i’ve managed to find a solution and replace fetching link, however twitter changed it again and i’m struggling.

I’m trying to fetch data in xml format using link:

And in return i got this error:
Bad Authentication data

What i’m doing wrong?
Ay help much appreciate…