java - Solr error when attempting to use a field set to a fieldtype of solr.StrField -

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i'm trying setup faceting through solr. have specific field use called "category". faceting works, appears lowercase , contains single word. i'm sure due field analyzer i've change field's type "string". produces error! see below.

fyi - i'm using solr 4.3.

you can see fieldtype , field below. can see field set fieldtype "string". field type uses "solr.strfield". why using fieldtype cause error below?

schema.xml

<types>     <fieldtype name="string" class="solr.strfield" sortmissinglast="true" />  </types>  <fields>     <field name="category" type="string" indexed="true" stored="true"     required="false" multivalued="false"/>     </fields>

i'm getting error message in log , when attempting run query

this attributesource not have attribute 'org.apache.lucene.analysis.tokenattributes.positionincrementattribute'

null:java.lang.illegalargumentexception: attributesource not have attribute 'org.apache.lucene.analysis.tokenattributes.positionincrementattribute'.

update: since error seems indicate fieldtype should have attribute positionincrementattribute, added string test. cleared , re-indexed, still no luck.

    <fieldtype name="string" class="solr.strfield" sortmissinglast="true"  positionincrementgap="100"/>


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