[antlr-interest] ANother mismatched token 0!=0

[G R]

Hi,
I'm trying to parse a file divide in 3 sections, each section contains a
field '=' a value.
Here is an exemple that' i am trying to parse :

[config]
id = 420
revision= 1
severity.tag=@_TAG_SEVERITY
severity.high        = [1-2]
severity.medium        = [3]
severity.low        = [4-6]
severity.info        = (?:[7-9]|10|11|12|13)
[classification]
classification.severity = true
auth = ((?:109|113)\d*)
bridge = ((?:101|102|103|104|709)\d*)
[idmef]
additional_data(1).type = string
additional_data(1).meaning = blablabla
additional_data(1).data = $3
additional_data(0).type = string
additional_data(0).meaning = blublublu
additional_data(0).data = $2

I got the following grammar :

grammar GlobalConfig;
options {
    language=Java;
}
tokens {
    CONFIG_START = '[config]';
    CLASS_START = '[classification]';
    IDMEF_START = '[idmef]';
    ID = 'id';
    REV = 'revision';
    SEV_TAG = 'severity.tag';
    SEV_HI = 'severity.high';
    SEV_MED = 'severity.medium';
    SEV_LO = 'severity.low';
    SEV_IN = 'severity.info';
    CLAS_SEV = 'classification.severity';
    TRUE = 'true';
    FALSE = 'false';
}
@members{
...}
configFile
    :    CONFIG_START configPart CLASS_START classificationPart IDMEF_START
idmefPart EOF;

configPart
@init{
this.classes = new ArrayList<String>();
this.classesValues = new TreeMap<String, String>();
this.idmefPaths = new TreeMap<String, String>();
}
    :    id rev severity;
    id    :    ID '=' DIGITS NEWLINE
        {this.id = $DIGITS.text;};
    rev    :    REV '=' DIGITS NEWLINE
        {this.rev = $DIGITS.text;};
    severity
        :    severityTag severityHigh severityMed severityLow severityInfo;
        severityTag
            : SEV_TAG  '=' TAG NEWLINE
            {this.sev_tag=$TAG.text;};
        severityHigh
            : SEV_HI '=' VALUE NEWLINE
            {this.sev_high=$VALUE.text;};
        severityMed
            : SEV_MED '=' VALUE NEWLINE
            {this.sev_medium=$VALUE.text;};
        severityLow
            : SEV_LO '=' VALUE NEWLINE
            {this.sev_low=$VALUE.text;};
        severityInfo
            : SEV_IN '=' VALUE NEWLINE
            {this.sev_info=$VALUE.text;};

classificationPart
    :    CLAS_SEV '=' (on | off);
    on
    @init{this.classificationSeverity=true;}
        : TRUE NEWLINE classes;
        classes
            : (LITERAL NEWLINE)+
            {this.classes.add($LITERAL.text);};
    off
    @init{this.classificationSeverity=false;}
        : FALSE NEWLINE classesValues;
        classesValues
            : (LITERAL '=' VALUE NEWLINE)+
            {this.classesValues.put($LITERAL.text, $VALUE.text);};


idmefPart
    :    (IDMEFPATH '=' VALUE)+
    {this.idmefPaths.put($IDMEFPATH.text, $VALUE.text);};


IDMEFPATH
    :    LETTER (LETTER | SCORIES);
VALUE
    :    (SCORIES | DIGITS | LETTER)+;
DIGITS
    :    DIGIT+;

TAG
    :    '@_' LITERAL;
LITERAL
    :    LETTER (LETTER | '-' | '_')*;

fragment SCORIES
    :    '-' | '_' | ':' | '.' | '?' | '!' | '|' | '@' | '#' | '$' | '^' |
'~' | '(' | ')' | '[' | ']' | '\\' | '/' | '*';
fragment LETTER
    :    ('a'..'z' | 'A'..'Z');
fragment DIGIT
    :    '0'..'9';

NEWLINE
    :    '\r'? '\n';
WS
    : (' '|'\t'|'\n'|'\r')+ {skip();};

Each time i try to parse the config file i gave you before the grammar, I
get an error with the parser rule "id" saying :
BR.recoverFromMismatchedToken
line 2:5 mismatched input '420' expecting DIGITS
and in ma parsed tree I got :
ID = MismatchedTokenException 0!=0

I can't find a way to solved this, and i don't understand what is my error,
although I'm nearly sure this is a very stupid error.
Can anyone help ?

Thanks.
G.R
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