The Navision restore into SQL does a security sync at the end. The error you are getting is because you have a role configured that refers to Table 50000 and that table does not exist.
To solve:
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Go back to you native DB
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Run the Permission table from object designer
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Filter where “Object ID” > 0 AND “Object Name” = ‘’
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This will be all references to objects that do not exist. Delete these entries
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Make a new backup and restore