Why, "Expected version between 2.1 and 2.dev but got 1.14"

Questions
1

When trying to upload a DAR to a participant, I see the following error:

upload-dar did not succeed:
"ALLOWED_LANGUAGE_VERSIONS(8,a276e426):
Disallowed language version in package 86828...:
Expected version between 2.1 and 2.dev but got 1.14"

What could cause this?

2

In this particular case, I was doing the following:

  • Uploading a 2.x-compiled DAR
    (language version 1.14)
  • Into a 3.x participant node
    (which supports language version 2.1 or 2.dev)

Also see the ALLOWED_LANGUAGE_VERSIONS docs.

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