I assume this is the log produced by another system when you try to import a WikiTree-created GEDCOM into that system.
Some of the errors won't represent actual problems. For example, it may not be able to interpret the _MIDN tag (middle name), _MARN (married name, which we use for Current Last Name), or _AKA (which we use for Other Last Names). The system may not have equivalent fields. Some systems import and export the entire name using just one NAME field.
In many cases, no data will be lost because the NAME field condenses the key name fields.