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@Verytas Seems you are trying to use latest master branch with 7.x client. However master = 8.0.1.28153. For 7.3.5 you probably want to go back to the commit that supported that version. For example: git checkout -b 7.3.5 7.3.5/26972 See https://github.com/TrinityCore/TrinityCore/tags and https://git-scm.com/book/en/v2/Git-Basics-Tagging

TC's mysql requierement is 5.1 or higher. updating to 5.6 won't fix nothing. The problem indeed, lies here. He needs mysql client and server to be the same.