i'm certainly no expert in that field, but any errors with "origin" usually point to a mixture of http and https access.
I have also seen this (iirc) when mixing e.g. mydomain.com and www.mydomain.com. Browsers seem to block this because they think it is some cross-site-scripting attack, even if both URLs physically point to the same web space.
Other than that, i'm really running out of ideas...
that's weird... the filename seems to be "kind of" OK (the "\ /" backslash+slash could maybe confuse the browser) but i have no idea where the "()" at the end comes from.
Since the error message seems to be output by your browser:
In Firefox or Chrome hit F12 to open the Developer Tools, reload the page and check for any messages esp. in the Console output, that could give you a hint as to what's going wrong.
I don't think that it is a problem of write access because this happens on my local with wampserver and on my site. I try with my user witch is superadmin and it's the same thing..
can you give me a trick to debug the problem? I would like to give the opportunity of elevation diagram to my customer.
thank you for your answer