Error while upgrade Plone 5.1.5 to 5.2

While buildout

Error: Couldn't find a distribution for 'trollius==2.2'.

Can anyone suggest a fix?

The cause of the problem is described in "https://github.com/zopefoundation/ZEO/issues/146". Solution: look at PyPI to find out what version is made available and update the version pin to that version.

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