8.0.3 File Uploads Fail with Error

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Dragging or choosing any file to upload results in error:
Cannot redeclare mb_convert_encoding() (previously declared in /usr/share/concrete5/8.0.3/vendor/symfony/polyfill-mbstring/bootstrap.php:19)
Has anyone else encountered this? I suspect it's to do with the environment but am not sure where to look next.
Think it's related to this:https://github.com/concrete5/concrete5/issues/3963... and the mbstring php module not being available in the hosting environment.
++Edit
Can confirm that installing mbstring fixed this issue for me.
apt-get install php5.6-mbstring

or, perhaps for you
apt-get install mbstring

followed by
phpenmod mbstring

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madesimplemedia replied on at Permalink Reply
madesimplemedia
Got the same error in v8.2 when adding a page. However, I dismissed it and choose a location for the page and manually added the url slug and it added the page fine. Weird.