Solr JSON Facet API Stack Trace

[ERROR 2018-02-15 18:51:21.822     x:vb_popbio org.apache.solr.common.SolrException org.apache.solr.common.SolrException: Invalid Date String:'Fri Aug 01 00:00:00 UTC 2014'
	at org.apache.solr.util.DateMathParser.parseMath(DateMathParser.java:234)
	at org.apache.solr.schema.TrieField.readableToIndexed(TrieField.java:449)
	at org.apache.solr.schema.FieldType.getFieldQuery(FieldType.java:776)
	at org.apache.solr.schema.TrieField.getFieldQuery(TrieField.java:414)
	at org.apache.solr.search.facet.FacetFieldProcessor.findTopSlots(FacetFieldProcessor.java:336)
	at org.apache.solr.search.facet.FacetFieldProcessorByArray.calcFacets(FacetFieldProcessorByArray.java:110)
	at org.apache.solr.search.facet.FacetFieldProcessorByArray.process(FacetFieldProcessorByArray.java:58)
	at org.apache.solr.search.facet.FacetProcessor.processSubs(FacetProcessor.java:455)
	at org.apache.solr.search.facet.FacetFieldProcessor.fillBucket(FacetFieldProcessor.java:396)
	at org.apache.solr.search.facet.FacetFieldProcessor.findTopSlots(FacetFieldProcessor.java:338)
	at org.apache.solr.search.facet.FacetFieldProcessorByArray.calcFacets(FacetFieldProcessorByArray.java:110)
	at org.apache.solr.search.facet.FacetFieldProcessorByArray.process(FacetFieldProcessorByArray.java:58)
	at org.apache.solr.search.facet.FacetProcessor.processSubs(FacetProcessor.java:455)
	at org.apache.solr.search.facet.FacetProcessor.fillBucket(FacetProcessor.java:407)
	at org.apache.solr.search.facet.FacetQueryProcessor.process(FacetQuery.java:64)
	at org.apache.solr.search.facet.FacetModule.process(FacetModule.java:148)
	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:304)
	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:173)
	at org.apache.solr.core.SolrCore.execute(SolrCore.java:2477)
	at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:723)
	at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:529)
	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:361)
	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:305)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1691)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
	at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
	at org.eclipse.jetty.server.Server.handle(Server.java:534)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
	at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
	at java.lang.Thread.run(Thread.java:745)