I also got the same error due to the use of copies in the "PF" parameter for solr. remove all copy fields from the "PF" parameter, it will work smoothly.
My Solr Schema => copyField source = "name" dest = "sname"
My SolrConfig file => attr_Cuisines ^ 20 sname ^ 10 neighborhood ^ 5 tackles ^ 10 tags ^ 1 features ^ 2
when i removed the "sname" parameter from "pf" it worked
mahesh varak
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