error(202): ../org.xtext.example.mydsl/src-gen/org/xtext/example/mydsl/parser/antlr/internal/InternalMyDsl.g:286:3: the decision cannot distinguish between alternative(s) 1,2 for input such as "RULE_ID EOF EOF"

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

Model:
	(elements+=Enumeration)*
;
	
Enumeration:
	{Enumeration}
	'Enumeration' name=ID '{' 
		(encoding=Encoding)
	'}'
;

Encoding:
	{Encoding}
	Annotations
	name=ID 
;

fragment Annotations *:
	(annotations+=Annotation)*
;
Annotation:
	{Annotation}
	'@'(name=ID)?
;

Enumeration ABC {
    @
    MyEncoding
}

Annotation hidden():
	{Annotation}
	'@'(name=ID | WS)
;