[Evolution] pls explain to me an error msg

[mario chiari <ml mariochiari net>]

Hi

I get this error msg

** Message: console message:
mail://local/Inbox%2FArt%20Newsletter/1479199473.5059_7593.fedora-
pc?part_id=.message.alternative-prefer-
plain.1.text_html&mode=2&formatter_default_charset=&formatter_charset= @5:
Viewport argument value "1.0;" for key "maximum-scale" was truncated to its
numeric prefix. Note that ';' is not a separator in viewport values. The list
should be comma-separated.

what does it mean?
thanks
cheers
mario