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Sometimes you'll see something like this error, especially with var args methods, or methods with the Any type

Error:(41) ambiguous reference to overloaded definition,
both method someMethod in class SomeClass of type (x$1: String, etc)Unit
and  method someMethod in class SomeClass of type (x$1: String, etc)Unit
match argument types (String)

This means scala can't differentiate between two methods.

This stackoverflow thread talks about it some more. And this scala bug report is working on it.

It's not ideal, and it's slower than direct calls, but you can use Java's reflection to outcome this, while you wait for the Scala fix:

  classOf[SomeClass].getMethod("someMethod", classOf[String]).invoke(this, "Some arg")

This way you explicitly define the method, specifying its parameters, that you want to call.