Multiple issues on testing zocial

[webmasterpf]

Hi

i test this compass plugin but i get multiple issues :

Invalid CSS after "...ial-font-weight": expected selector or at-rule, was ": bold" into settings of zocial for this line :
$zocial-font-weight: bold

then other issue for the mixin used like this:

.content-bottom-home { a { @include zocial; } }
give this : Undefined mixin 'zocial'.

thanks for help