Plugin Initializing failure for JTS

Question

I am new in Solr. I install Solr 5.5.0 on my Ubuntu server and it was running fine until I tried to install JTS.

I download the JTS library and placed it under "/opt/solr-5.5.0/server/solr-webapp/webapp/WEB-INF/lib".

I tried the following code in my managed-schema file:

<fieldType name="location_rpt" class="solr.SpatialRecursivePrefixTreeFieldType" spatialContextFactory="org.locationtech.spatial4j.context.jts.JtsSpatialContextFactory" geo="true" distanceUnits="kilometers"/>

and also this:

<fieldType name="bbox" class="solr.BBoxField" spatialContextFactory="org.locationtech.spatial4j.context.jts.JtsSpatialContextFactory"
        geo="true" distanceUnits="kilometers" numberType="_bbox_coord" />
<fieldType name="_bbox_coord" class="solr.TrieDoubleField" precisionStep="8" docValues="true" stored="false"/>

But when I am trying to access my Solr through the browser, it's giving me following error:

Can't load schema /var/solr/data/mykeywords/conf/managed-schema: Plugin Initializing failure for [schema.xml] fieldType

Not sure what's going wrong here, can anyone please suggest me any solution?