Gerrit Jan

Hello, my name is Gerrit Jan, I am a Dutch man, and I live in France. When cooking for guests I often return to Julia Child'´s Mastering the French cuisine. I just tried her Aspic with apples, but it didn't come out right. First of all the 1 liter mould miss Child recommends proved to small for the amount of apples. When I dismoulded the aspic it more or less collapsed, and what was worse, the juice came out. Does anyone know what could have caused this? Thanks in advance.