Refresh materialied view

Hello,

I have two schemas, a and b,  on the schema b I have a materialized view  with a log,  I need to be able  to refresh it trought a dblink from the schema a to schema b, but  I get the following error:

ORA-20000: ORA-00979: illegal reference to remote database

ORA-06512: en "SYS.DBMS_SNAPSHOT", línea 2254T

What should I do in this case? or is there any better way to do this??

Thanks