'Antlr.Runtime.MismatchedTokenException' thrown when parsing HQL query

The following HQL query throws this exception:

select distinct fm from ReceivedFax f join f.ReceivingFaxMachine fm
where fm.Deactivated = :deactivated and f.Status in (:new, :detached)

The exception is thrown in the Match() call of the following method:
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////
public HqlParser.identifier_return identifier() // throws
RecognitionException [1]
{
HqlParser.identifier_return retval = new
HqlParser.identifier_return();
retval.Start = input.LT(1);
IASTNode root_0 = null;
IToken IDENT292 = null;
IASTNode IDENT292_tree=null;
try
{
// C:\\Users\\Steve\\Documents\\NHibernate\\nhibernate
src
\\NHibernate\\Hql\\Ast\\ANTLR
Hql.g:659:2: ( IDENT )
// C:\\Users\\Steve\\Documents\\NHibernate\\nhibernate
src
\\NHibernate\\Hql\\Ast\\ANTLR
Hql.g:659:4: IDENT
{
root_0 = (IASTNode)adaptor.GetNilNode();
IDENT292=(IToken)Match(input,IDENT,FOLLOW_IDENT_in_identifier3551);
IDENT292_tree = (IASTNode)adaptor.Create(IDENT292);
adaptor.AddChild(root_0, IDENT292_tree);
}
retval.Stop = input.LT(-1);
retval.Tree =
(IASTNode)adaptor.RulePostProcessing(root_0);
adaptor.SetTokenBoundaries(retval.Tree, (IToken)
retval.Start, (IToken) retval.Stop);
}
catch (RecognitionException ex)
{
retval.Tree = HandleIdentifierError(input.LT(1),ex);
}
finally
{
}
return retval;
}
/////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////

I've also taken the liberty of including my stack trace:

/////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.RecoverFromMismatchedToken(Antlr.Runtime .IIntStream
input =
{selectdistinctfmfromReceivedFaxfjoinf.ReceivingFaxMachinefmwherefm.Deactiv ated=:deactivatedandf.Statusin(:new,:detached)},
int ttype = 123, Antlr.Runtime.BitSet follow = {1}) Line 111 + 0x31
bytes C#
[External Code]
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParser.identifier() Line
10715 + 0x35 bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.primaryExpression() Line 8658 + 0xc
bytes C#
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParser.atom() Line 8367 +
0xc bytes C#
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParser.unaryExpression()
Line 7478 + 0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.multiplyExpression() Line 7108 +
0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.additiveExpression() Line 6966 +
0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.bitwiseAndExpression() Line 6864 +
0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.bitwiseXOrExpression() Line 6764 +
0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.bitwiseOrExpression() Line 6664 +
0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.bitwiseNotExpression() Line 6600 +
0xc bytes C#
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParser.concatenation()
Line 6420 + 0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.relationalExpression() Line 5792 +
0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.equalityExpression() Line 5565 +
0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.negatedExpression() Line 5468 + 0xc
bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.logicalAndExpression() Line 5307 +
0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.logicalOrExpression() Line 5207 +
0xc bytes C#
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParser.expression() Line
5145 + 0xc bytes C#
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParser.compoundExpr()
Line 9971 + 0xc bytes C#
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParser.inList() Line 6259
+ 0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.relationalExpression() Line 6010 +
0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.equalityExpression() Line 5565 +
0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.negatedExpression() Line 5468 + 0xc
bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.logicalAndExpression() Line 5333 +
0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.logicalOrExpression() Line 5207 +
0xc bytes C#
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParser.expression() Line
5145 + 0xc bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.HqlParser.logicalExpression() Line 5087 + 0xc
bytes C#
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParser.whereClause() Line
4842 + 0xc bytes C#
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParser.queryRule() Line
1623 + 0xc bytes C#
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParser.selectStatement()
Line 1227 + 0xc bytes C#
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParser.statement() Line
431 + 0xc bytes C#
NHibernate.dll!NHibernate.Hql.Ast.ANTLR.HqlParseEngine.Parse() Line
493 + 0x10 bytes C#
NHibernate.dll!
NHibernate.Hql.Ast.ANTLR.ASTQueryTranslatorFactory.CreateQueryTranslators(s tring
queryString = "select distinct fm from ReceivedFax f join
f.ReceivingFaxMachine fm where fm.Deactivated = :deactivated and
f.Status in (:new, :detached)", string collectionRole = null, bool
shallow = false,
System.Collections.Generic.IDictionary<string,NHibernate.IFilter>
filters = Count = 0, NHibernate.Engine.ISessionFactoryImplementor
factory = {NHibernate.Impl.SessionFactoryImpl}) Line 19 + 0x4d bytes
C#
NHibernate.dll!
NHibernate.Engine.Query.HQLStringQueryPlan.CreateTranslators(string
hql = "select distinct fm from ReceivedFax f join
f.ReceivingFaxMachine fm where fm.Deactivated = :deactivated and
f.Status in (:new, :detached)", string collectionRole = null, bool
shallow = false,
System.Collections.Generic.IDictionary<string,NHibernate.IFilter>
enabledFilters = Count = 0,
NHibernate.Engine.ISessionFactoryImplementor factory =
{NHibernate.Impl.SessionFactoryImpl}) Line 24 + 0x9f bytes C#
NHibernate.dll!
NHibernate.Engine.Query.HQLStringQueryPlan.HQLStringQueryPlan(string
hql = "select distinct fm from ReceivedFax f join
f.ReceivingFaxMachine fm where fm.Deactivated = :deactivated and
f.Status in (:new, :detached)", string collectionRole = null, bool
shallow = false,
System.Collections.Generic.IDictionary<string,NHibernate.IFilter>
enabledFilters = Count = 0,
NHibernate.Engine.ISessionFactoryImplementor factory =
{NHibernate.Impl.SessionFactoryImpl}) Line 16 + 0x3e bytes C#
NHibernate.dll!
NHibernate.Engine.Query.HQLStringQueryPlan.HQLStringQueryPlan(string
hql = "select distinct fm from ReceivedFax f join
f.ReceivingFaxMachine fm where fm.Deactivated = :deactivated and
f.Status in (:new, :detached)", bool shallow = false,
System.Collections.Generic.IDictionary<string,NHibernate.IFilter>
enabledFilters = Count = 0,
NHibernate.Engine.ISessionFactoryImplementor factory =
{NHibernate.Impl.SessionFactoryImpl}) Line 10 + 0x2c bytes C#
NHibernate.dll!
NHibernate.Engine.Query.QueryPlanCache.GetHQLQueryPlan(string
queryString = "select distinct fm from ReceivedFax f join
f.ReceivingFaxMachine fm where fm.Deactivated = :deactivated and
f.Status in (:new, :detached)", bool shallow = false,
System.Collections.Generic.IDictionary<string,NHibernate.IFilter>
enabledFilters = Count = 0) Line 61 + 0x4e bytes C#
NHibernate.dll!
NHibernate.Impl.AbstractSessionImpl.GetHQLQueryPlan(string query =
"select distinct fm from ReceivedFax f join f.ReceivingFaxMachine fm
where fm.Deactivated = :deactivated and f.Status in
(:new, :detached)", bool shallow = false) Line 294 + 0x83 bytes C#
NHibernate.dll!
NHibernate.Impl.AbstractSessionImpl.CreateQuery(string queryString =
"select distinct fm from ReceivedFax f join f.ReceivingFaxMachine fm
where fm.Deactivated = :deactivated and f.Status in
(:new, :detached)") Line 273 + 0x37 bytes C#
Test.App.Hibernate.dll!
Test.App.Hibernate.PersistenceContext.CreateHibernateQuery(string hql
= "select distinct fm from ReceivedFax f join f.ReceivingFaxMachine
fm where fm.Deactivated = :deactivated and f.Status in
(:new, :detached)") Line 208 + 0x3c bytes C#
/////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////

MAPPING FILE:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="TestApp.Fax" namespace="TestApp.Fax">
<joined-subclass name="ReceivedFax" proxy="ReceivedFax"
table="ReceivedFax_" extends="TestApp.AttachedDocument,TestApp">
<key column="AttachedDocumentOID_" />
<property name="Status" column="Status_"
type="TestApp.Fax.Hibernate.ReceivedFaxStatusEnumHbm,
TestApp.Fax.Hibernate" not-null="true" access="nosetter.camelcase-
underscore"/>
<property name="StateChangeTime" column="StateChangeTime_"
type="DateTime" not-null="true" access="nosetter.camelcase-underscore"/

<property name="PageCount" column="PageCount_" type="int"/>
<many-to-one name="ReceivingFaxMachine" class="FaxMachine"
column="ReceivingFaxMachineOID_" not-null="true" fetch="join"/>
<property name="SenderName" column="SenderName_" type="string"
length="256"/>
<property name="SenderNumber" column="SenderNumber_" type="string"
length="32"/>
</joined-subclass>
</hibernate-mapping>

Thanks!