Distributed Monitoring failing after fallback

Dear Forum.

I have a test checkmk enviorment (1.6.0p8). Where i have tested upgradeing all the sites at once.
This works flawlessly! But when i try to fall back to 1.5.0p16 i get this mega error?

Anyone else have seen this?

If i run my upgrade script one more i get to 1.6.0p8 wirh no problems or erros

Hi,
this is not possible.
You can’t downgrade from 1.6.0.

From the Download page:
Note: Please keep in mind that a downgrade of Checkmk 1.6 to older versions is not possible.

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I dont always read the small text, thanks!

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