It was 8 years ago when Esri published a famous "Customizing locators in ArcGis 10" whitepaper. They also gave us more than 50000 lines of magic Xml covering US address styles.
I tried to make a rather simple locator style file, removing everything I found unnecessary. After a week or more I had something between 400 and 600 lines of xml file that I pushed to Create Address Locator geoprocessing tool.
I've got "Error code 42". Nothing more. A good sense of black humour.
Do you have any piece of advice how to get more diagnostics?