SP-Config Import Source Import Failed

Would someone know why I am getting these errors when trying to import?

Is it because the source already exist? Are we able to overwrite a source?

"key": "SOURCE_IMPORT_FAILED",
                    "text": "An error occurred importing source: 'Mimecast GLBA w/out Geo'",
                    "detail": {
                        "exceptionMessage": "Duplicate attributes name, Name"
                    }

&

"key": "SOURCE_IMPORT_FAILED",
                   "text": "An error occurred importing source: 'Weiland Citrix Critical w/out Geo'",
                   "detail": {
                       "exceptionMessage": "Field \"manager\" is mapped to identity attribute \"manager\" by the default identity profile mapping for this source type. Field \"givenName\" is mapped to identity attribute \"firstname\" by the default identity profile mapping for this source type. Referenced by internal main attribute \"groupAttribute\". Contact SailPoint. Referenced by internal schema property \"groups\". Contact SailPoint. Referenced by internal main attribute \"displayAttribute\". Contact SailPoint. Referenced by internal main attribute \"accountAttribute\". Contact SailPoint."
                   }

Welcome to the developer community Sam.

SP Config is most likely trying to merge account attributes on an existing source. What are the account attributes for the existing source, and what are the account attributes for the source you are trying to replace it with? Does the original use name while the new version uses Name?