We had used the ID Generator managed solution from Planet Technologies on a CRM 2015 instance for UAT. The solution worked just fine for almost 7 months but then started throwing a "Unexpected error" for the plugin in this solution when creating new leads. We were also facing difficulty in removing this solution which was also throwing the same error. Finally we managed to unregister the plugin steps using Plugin Registration tool and successfully removed the solution from the system.
Having done this, we wanted to import back the same solution but for some reason the solution import wizard gives an error "The Import file is too large to upload" now.

What could be the reason for this?
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