It is a bad practice to `+throw+` something that's not derived at some level from `+Error+`. If you can't find an existing `+Error+` type that suitably conveys what you need to convey, then you should extend `+Error+` to create one.
Specifically, part of the point of throwing \`+Error+`s is to communicate about the conditions of the error, but literals have far less ability to communicate meaningfully than \`+Error+`s because they don't include stacktraces.