Plugin init failure for custom analysis filter

Getting this error below on adding new custom filter to schema.xml:
org.apache.solr.common.SolrException:org.apache.solr.common.SolrException: Plugin init failure for [schema.xml] fieldType "textCustom": Plugin init failure for [schema.xml] analyzer/filter: Error instantiating class: 'org.apache.solr.analysis.Custom.CustomFilterFactory'. Schema file is /opt/solr5/collection3/schema.xml

I tried adding jar of my custom filter to /solr/collection/lib path as mentioned in this link: http://stackoverflow.com/questions/7828619/basetokenfilterfactory-not-found-by-solr-with-custom-filter but same error.