SSL Let's Encrypt + Tomcat 7 - ssl

Question

I have installed an Open Source application called Mifos, but when I try to install the LS certificate in tomcat 7 for some reason the browser doesn't recognize it.
Here is the response from the browser:
Browser
The certificates are located in this directory: /usr/share/tomcat7/conf
root#ubuntu-s-1vcpu-2gb-nyc1-01:~# ls -l /usr/share/tomcat7/conf/
total 236
drwxr-xr-x 3 root root 4096 Feb 11 02:16 Catalina
-rw------- 1 root root 2259 Feb 11 09:30 OrgServ.xml
-rw------- 1 root root 13186 Feb 8 2018 catalina.policy
-rw------- 1 root root 6496 Feb 8 2018 catalina.properties
-rwxrwxrwx 1 root root 1846 Feb 11 21:44 cert.pem
-rwxrwxrwx 1 root root 3749 Feb 11 21:44 chain.pem
-rw------- 1 root root 1394 Feb 8 2018 context.xml
-rwxrwxrwx 1 root root 5595 Feb 11 21:44 fullchain.pem
-rw------- 1 root root 3288 Feb 8 2018 logging.properties
-rwxrwxrwx 1 root root 1704 Feb 11 21:44 privkey.pem
-rw------- 1 root root 2773 Feb 11 23:11 server.xml
-rw------- 1 root root 1950 Feb 8 2018 tomcat-users.xml
-rw------- 1 root root 168844 Feb 8 2018 web.xml
I am using the following configuration file for tomcat 7:
XML Tomcat 7
<?xml version='1.0' encoding='utf-8'?>
<Server port="8005" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
<Listener className="org.apache.catalina.core.JasperListener" />
<Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
<Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
<GlobalNamingResources>
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
<Resource type="javax.sql.DataSource"
name="jdbc/mifosplatform-tenants"
factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
driverClassName="org.drizzle.jdbc.DrizzleDriver"
url="jdbc:mysql:thin://localhost:3306/mifosplatform-tenants"
username="us"
password="ps"
initialSize="3"
maxActive="10"
maxIdle="6"
minIdle="3"
validationQuery="SELECT 1"
testOnBorrow="true"
testOnReturn="true"
testWhileIdle="true"
timeBetweenEvictionRunsMillis="30000"
minEvictableIdleTimeMillis="60000"
logAbandoned="true"
suspectTimeout="60"
/>
</GlobalNamingResources>
<Service name="Catalina">
<Connector protocol="org.apache.coyote.http11.Http11Protocol"
port="443" maxThreads="150" scheme="https"
secure="true" SSLEnabled="true"
keystoreFile="/usr/share/tomcat.keystore"
keystorePass=""
clientAuth="false" sslProtocol="TLS"
URIEncoding="UTF-8"
compression="force"
compressableMimeType="text/html,text/xml,text/plain,text/javascript,text/css">
<SSLHostConfig>
<Certificate certificateFile="/usr/share/tomcat7/conf/cert.pem" certificateKeyFile="/usr/share/tomcat7/conf/privkey.pem" certificateChainFile="/usr/share/tomcat7/conf/chain.pem" />
</SSLHostConfig>
<!-- <SSLHostConfig>
<certificate certificateKeyFile="/etc/letsencrypt/live/mifosx.initone.io/privkey.pem" certificateFile="/etc/letsencrypt/live/mifosx.initone.io/cert.pem" certificateChainFile="/etc/letsencrypt/live/mifosx.initone.io/chain.pem" type="RSA" />
</SSLHostConfig> -->
</Connector>
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
<Engine name="Catalina" defaultHost="localhost">
<Realm className="org.apache.catalina.realm.LockOutRealm">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>
</Realm>
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true">
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="localhost_access_log." suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
</Engine>
</Service>
</Server>
Can you help me and tell me what mistake I am making?