I had this error, when I deployed a custom site-definition and then tried to create a new site-collection. The error was caused by a code I deployed some time before. I retracted those solutions and then deployed from scratch. It is important to clean out with old "not used" solutions. Also check in the Central-Administration, if all not used solutions are removed. After the new deployment, everything went smooth.
It could also be, that there is somewhere an assembly, that is called the same or does have similar namespaces.
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