Hello,
after a ComfortUpdate I did a month ago I see such error:
CDbCommand SQL: SQLSTATE[HY000]: General error: 1273 Unknown collation: 'utf8mb4_bin'
I did it the update from 2.50+ version, before the update the LS worked fine.

Unfortunately I am not a PHP whatsoever specialist. Any clue?

Nobody? Any tip? Anything to solve the problem?

collation is related to the database, not sure if that helps.

Think it may be the charset in the config file but not an expert here either.

How it is possible this happened after a ComfortUpdate?
Anybody has another opinion or idea?

MySQL have issue with emoji. This van break db . we nées to use emoji collation.

I think 2.06 dont use emoji collation. Try to install a 2.06 version. Or Update tour mysl server ( sée manual for minimum)

Having the same issue, turns out my MYSQL is too old.

"Your mysql version is too old, place it with the 5.6"

Tried various solutions like this stackoverflow.com/questions/29916610/127...b4-unicode-ci-cpanel but to no avail. Looks like I have to bite the bullet..

I did not solve this problem yet.
Where can I find the file having this line:
SQL: SQLSTATE[HY000]: General error: 1273 Unknown collation: 'utf8mb4_bin'

I came up to an idea, please correct me if I think wrong: my default admin language is Polish.
If I only could switch to English would that error still pop up?
Is there any way to change language setting directly in config files?
Or it make no sense and the error will appear anyways?

Oh, and I noticed LS has been installed on MySQL 5.0, that would be my solution here?
How can I take save and backup old surveys with all answers, tokens etc,?