I have gone through all the Kurento questions on Stackoverflow and this error dose not seem to have arisen before.
I have installed the Kurento media-server and java cli
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You have checked out the development version of the tutorials, 6.1.1-SNAPSHOT, which depends on other development versions of kurento artifacts. Those artifacts are not published in maven central, so you have three options here
.m2
repositorygit co 6.1.0
)In any case, the version of the tutorials should match the version of your KMS, so if you are using a development version of KMS, please use the development version of the tutorials. But if you are using a stable version of KMS, you should be using the matching release version of the tutorials.
You can find more info on how to work with development versions here