Engine error when loading map

I've packed up my BSP to be published, but when I open it in-game to test and see if everything is packed I get this error and the game closes

Too many verts for a dynamic vertex buffer (60480>49152) tell a programmer to up VERTEX_BUFFER_SIZE

What does this mean? I'm going to guess its a memory allocation error.

Alrighty I fixed the problem. The particle system sprites weren't being packed correctly it seems.