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When importing a ArcGIS geodatabase file using ModelBuilder, the following error message occurs: Object reference not set to an instance of an object
This issue has occurred because of security settings on the GIS portal. If settings cannot be changed, try to create a local geodatabase file on the local machine using the files from the GIS portal. Then use this local file in ModelBuilder.
Exporting the geodatabase data into a shapefile is another possible workaround.
Using ModelBuilder to import external data