Site Operation Aborted error in IE6

Please share your site link.

Here is a link with information that can help you identify the problem:

https://support.microsoft.com/kb/927917

this is the site https://dev.wpperhour.com/lls/rocco/

my problem now is i don’t know where to debug my site… maybe the error is cause by the theme… can you give me tips how to debug the part which gives me error

You should upgrade your IE browser now because IE6 has limited or buggy support for modern web standards.

Please go through the link:
https://www.browserupgrade.info/ie6/

It is highly likely that the problem is being caused by the theme. There are examples of what could be causing the problem in the article I posted. From that article it looks like you need to tidy up the Javascript that the theme is outputting.