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I’m getting the same error here. Somebody posted this issue on AdBlock support forum : http://support.getadblock.com/discussions/questions/107-avast-on-line-security . Here is the support staff answer :
"Hi and sorry for the late reply! Your best bet is to report this to Avast and ask them to “change the data: image used for PNG replacement to match AdBlock’s,” and include the error message you showed us.
AdBlock and other extensions have agreed to use that specific PNG data: image to stop this error from happening, so Avast can do the same to get the error to go away.
Hope this helps!
Michael"