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Error description

org.apache.solr.search.SyntaxError: Cannot parse ' (series_proper:( (Need to know\) )^2400 OR series_proper:("(Need to know\?)")^500 OR series2:("(Need to know\?)")^750 OR series:("(Need to know\?)")^1000)': Encountered "" at line 1, column 155. Was expecting one of: ... ... ... "+" ... "-" ... ... "(" ... ")" ... "*" ... "^" ... ... ... ... ... ... "[" ... "{" ... ... "filter(" ... ...