Error in user YAML: (<unknown>): did not find expected alphabetic or numeric character while scanning an alias at line 1 column 1
---
* formatName:
* formatVersion:
* extensions:
* mimeType:
* mimeTypeAliases:
* pronomId:
* xmlNameSpace:
* creatorTool:
* creatorToolUrl:
* formatSpecUrl:
---
For an example that make it clear how to fill out the fields, see here.