: that *may* be causing your problem, if the function parser is attempting : to generate the FieldCache for your content fields.
Yep ... that's it ... if you use a barefield name as a function, and that field name is not numeric, the result is an OrdFieldSource shiceh uses the FieldCache. I opened a bug to improve the error message... https://issues.apache.org/jira/browse/SOLR-1771 -Hoss
