Libgdx Gwt compile error with tween engine - java

[ERROR] Unable to find 'aurelienribon/tweenengine.gwt.xml' on your classpath; could be a typo, or maybe you forgot to include a classpath entry for source?
i followed every step in the libgdx wiki on how to install universal tween engine and it keeps giving me this error.
I have no idea what this aurelienribon.tweenengine.gwt.xml is since i cannot find it anywhere on my pc and i dont understand what i can do to fix it.
this is the guide i followed:
https://github.com/libgdx/libgdx/wiki/Universal-Tween-Engine
and i saw someone with the same problem on here who apparently fixed it but i could not deduct how exactly he did it from the details he gave.
thanks in advance.

Reason why it wasnt working was because i only had the tween-engine-api.jar in the libs folder created in the guide at:
https://github.com/libgdx/libgdx/wiki/Universal-Tween-Engine
it in fact needed to have the source jar as well which i did not have because i rarely use them. Turns out gwt needs them in order to compile.
so just to clarify, libs folder must have both tween-engine.api.jar and tween-engine-api-source.jar.

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