[I am having trouble logging in my avatar, giving this error log to the simulator.]

Hi

Are you wanting to log into the regular second life sim ?

Please provide further details.

[Problems with skin and clothes]

I have had the same problem many times trying to help new people upgrade their skin. A Linden told me it was a Viewer 2 problem they were aware of and watching.  It would be much easier if you used the old viewer for now, or try Emerald. Never saw that problem using either of those.