Don't panic! You can fix this pretty easily. Pop it in the freezer for about 10-20 minutes to help firm it up. Just be careful not to leave it in there too long For future reference, this usually means that there was too much moisture in your recipe. This can be due to a difference in the amount of paraffin in the chocolate chips, or if your sweetened condensed milk is thinner than usual. If your milk appears to be too thin, you can add about a quarter cup extra chocolate chips when mixing to help firm things up a bit.