It would be difficult to conclude the real cause of the error in your simulation with the information you provided.
Please provide more information on how you are implementing the slot antenna in the tool by providing the screenshots of your model with the object information, boundaries and excitations. Did you define any open region?
If it helps, you can design a slot antenna using the antenna toolkit in the tool which creates the whole simulation in simple steps. Then you can use this design reference to see where the error lies in your simulation.
All the very best, Praneeth.
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