Incorrect exception message

The wrong exception message is being generated for the exception covered in test case `testMissingAlias()`.

Before the message was:
"Provider instantiation failure: TestMissingDependency doesn't exist and could not be found by any registered autoloaders"

Using the correct exception message changes it to be:
"Could not make TestMissingDependency: Class TypoInTypehint does not exist"

i.e. it gives you the correct information about what the actual problem is, that one of the typehinted parameters for the class could not be made, rather than the class itself not existing.