#1 Access denied for user 'wikiuser'@'localhost'

[Kevin W. Gagel]

I've buggered up my install, I've tried re-installing, deleting every trace of it and re-installing again...

Still I get only this:
Site settings could not be loadedWe were unable to locate the API to request site settings. Please see below for debugging information.
HTTP Response Status Code: 500
An exception was thrown: Access denied for user 'wikiuser'@'localhost' (using password: YES) in MySql.Data
MySql.Data.MySqlClient.MySqlStream.OpenPacket () [0x00000]
MySql.Data.MySqlClient.NativeDriver.ReadOk (Boolean read) [0x00000]