Latest available version: IDA and decompilers v8.4.240320sp1 see all releases
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 Description:
        Two reasons can cause this problem:
          1.Reference to an illegal address is made in the program being
            disassembled;
          2.IDA couldn't find a name for the address but
            it must exist.
 What to do:
        1. If this problem is caused by a reference to an illegal address
            - try to enter the operand manually
            - or make the illegal address legal by creating a new segment.
        2. Otherwise, the database is corrupt.
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