Cydia mismatch error, and indexed files failed to load error.

Hi guys. I got 2 problems, every time I load cydia up I get an error that says "some indexed files failed to download, they have been ignored or old ones have been used instead." I've linked a screenshot in so you can see what it was trying to load.

And my last problem is every time I try to download a new tweek or app from cydia I get the "size mismatch" error.

I am useing the iPhone 3GS on iOS 6.1.2 (obviously jail broken) with evasi0n.

I have no idea how to solve these, all help is greatly appreciated.

Many thanks, napster100

I did add a screenshot but it looks like it hasn't loaded, not to sure but I'm doing this on my iPhone now and I can't see it. So this is what it was loading at startup "GPG error: http://apt.thebigboss.org stable Release:
The following signatures were invalid: NODATA 1 NODATA 2.

Failed to fetch
http://apt.thebigboss.org/repofiles/cydia/dists/stable/main/binary-iphoneos-arm/packages.bz2 sub-process /bin/bzip2 returned an error code (2)"

That's all it said.

 

I get the size mismatch error when I try to download anything.

 

Yes, I've had many reboots and resprings. I've found that removing thebigboss repo solves problem with the indexed files loaded. But since that is a default repo and contains many tweeks and apps I thought I should re-add it and the problem comes back. But it's been doing this for about a week now so if it was the repo's problem I should of been fixed by now right? My next thought is to re-jailbreak but I can't do that until tonight and I don't want to lose all my current tweaks and apps though.