The process got killed while performing

BSobj = makeBSseqData(list(dat7, dat8, dat9, dat10, dat11, dat12), c("sample1"...."sample12"))

I have 64 Gb Ram space.

Need a solution..

'The process got killed' doesn't provide much information. That could be due to more than one thing. But the simplest explanation is that you don't have sufficient RAM. The solution is to get more, either by adding to your computer or using one that already has more RAM.