Hello Hasan,
Can you check the mesh statistics in your model and see if number are nodes are falling inside the criteria I mentioned earlier, DOF can be calculated by number of nodes*3 for solid elements and nodes*6 for shells. Have you tried changing to linear element formualtion or making a coarse mesh. Your message tells you have around 14GB available memory, whereas this model requires about 25GB memory. You can switch solver type to iterative, this needs less memory to solve.
Regards,
Nanda.
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