Swift Compiler Error Arithmetic operation ' * * ' (on type ' * * ') results in an overflow (overflow operator ' &+ ')

Swift Compiler Error arithmetic operation ' ****** ' (on type ' * * * ') results in an overflow

Error code:

The cause of the error is an overflow condition in a numeric operation. The result exceeds the range of the UInt8 0~255. Unlike OC, a value overflow in an operation is not allowed by default. But you can use the overflow operator to operate

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Swift Compiler Error Arithmetic operation ' * * ' (on type ' * * ') results in an overflow (overflow operator ' &+ ')