created a customised world ,which I thereafter gotten the world seed (5522030681088272581).
Created a new world , didn't create the world only void and space. Exited the world and reload it again , hold on the download world screen for long period. exit the application to see the launcher says out of memory

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my Specs:
Processor Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz
Video Card NVIDIA GeForce GT 640
Memory 16 GB
Operating System Microsoft Windows 10 , 64-bit