gwt something other than an int was returned from jsni method

Question

since today i get an this error message for the same code like yesterday, but i changed nothing. i get this error message

[WARN] [perchsearch] - Something other than an int was returned from JSNI method '@com.google.gwt.dom.client.DOMImplStandardBase$ClientRect::getTop()': Rounding double (178.40000915527344) to int for int

and when i run the project on the browser a strange grafic object appears on the chrome browser (for firefox doesnt exists a gwt plugin for my version) , but i dont know how and from where.here is the pic of this grafic.

is there any solution how i can remove this thing? its really anoying.

Answer 1

I get that error when changing the zooming in Chrome. Just reset it to 100%.