# Diagnostic codes - [MN0001: view el must be dom element](/errors/MN0001.md): retired - [MN0002: region el type invalid](/errors/MN0002.md): retired - [MN0003: view already owned](/errors/MN0003.md): active - [MN0004: region el required](/errors/MN0004.md): active - [MN0005: region el not found](/errors/MN0005.md): active - [MN0006: region view required](/errors/MN0006.md): retired - [MN0007: region view destroyed](/errors/MN0007.md): active - [MN0008: region definition invalid](/errors/MN0008.md): retired - [MN0009: event bindings invalid](/errors/MN0009.md): retired - [MN0010: request bindings invalid](/errors/MN0010.md): retired - [MN0011: collection view child view required](/errors/MN0011.md): active - [MN0012: collection view child view invalid](/errors/MN0012.md): retired - [MN0013: collection view container not found](/errors/MN0013.md): active - [MN0014: collection view filter invalid](/errors/MN0014.md): retired - [MN0015: collection view swap non children](/errors/MN0015.md): active - [MN0016: behavior definition invalid](/errors/MN0016.md): retired - [MN0017: radio channel name required](/errors/MN0017.md): active - [MN0018: ui reference invalid](/errors/MN0018.md): active - [MN0019: handler not callable](/errors/MN0019.md): active - [MN0020: named region not found](/errors/MN0020.md): active - [MN0021: radio channel not found](/errors/MN0021.md): active - [MN0022: collection view empty view invalid](/errors/MN0022.md): retired - [MN0023: ui elements unavailable](/errors/MN0023.md): active - [MN0024: child container argument invalid](/errors/MN0024.md): active - [MN0025: child container method not callable](/errors/MN0025.md): retired - [MN0026: entity event name unsafe](/errors/MN0026.md): active - [MN0027: feature name invalid](/errors/MN0027.md): retired - [MN0028: region destroyed operation](/errors/MN0028.md): retired - [MN0029: view destroyed set element](/errors/MN0029.md): retired - [MN0030: region registration conflict](/errors/MN0030.md): active - [MN0031: application registration conflict](/errors/MN0031.md): active - [MN0032: region name invalid](/errors/MN0032.md): active - [MN0033: merge options keys invalid](/errors/MN0033.md): retired - [MN0034: state key invalid](/errors/MN0034.md): retired - [MN0035: state ownership conflict](/errors/MN0035.md): retired - [MN0036: event delegator contract invalid](/errors/MN0036.md): retired - [MN0037: adapter observation unsupported](/errors/MN0037.md): active - [MN0038: adapter cleanup invalid](/errors/MN0038.md): retired - [MN0039: collection data contract invalid](/errors/MN0039.md): active [Canonical source](/docs/markdown/config/diagnostics/catalog.json) · [Source identity](/docs/manifest.json)