R studio was forced to restart

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Anyone can explain what does this mean? I ran xgboost with tree model, it took me four hours to finish up tuning all the parameters. When i tried to use vip function to show the important variables, but R studio was forced to restart, so my work was gone. The author of this method told me to check if it is RAM problem. She said "If the problem is RAM, you might want to do something like computing that in a fresh session with the saved model or something". I am not sure what does it mean?

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