"Unable to locate class or view [{$alias}] for component [{$component}]."

[lokeshkumar12471]

when my installation was done after that iam trying to give
"Unable to locate class or view [{$alias}] for component [{$component}]."
this error was displaying

[xorock]

This happens when prefix is empty. But, when setting it another error comes class_exists(): Argument #1 ($class) must be of type string, array given