igmp-proxy VIF limit reached

I´m working whith a RB1100 4.15, 200 customers with PPPoE.

after customer 130, log show VIF limit reached, cannot add pppoe-xxxx, and multicast stops working for all the customers including the ones dinamically added to the igmp proxy VIF.

tried adding manually VIF, they are added but log shows the same error of VIF limit reached…

is there a way to send multicast over the PPPoE connection or pass trough this limit?

VHG