SSLHandshakeException on connection

I'm trying to implement Smack 4.1 in my android app to communicate witch my ejabberd server, during the connection i get the following exception

10-24 16:30:55.479 21033-21070/com.demo.xmppchat D/dalvikvm﹕ GC_FOR_ALLOC freed 370K, 3% free 17153K/17556K, paused 10ms, total 10ms

10-24 16:30:55.489 21033-21070/com.demo.xmppchat D/SMACK﹕ SENT (0): <stream:stream xmlns='jabber:client' to='178.62.199.13' xmlns:stream='http://etherx.jabber.org/streams' version='1.0'>

10-24 16:30:55.559 21033-21071/com.demo.xmppchat D/SMACK﹕ RCV (0): <?xml version='1.0'?><stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='3386981479' from='178.62.199.13' version='1.0' xml:lang='en'><stream:features><starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/><mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'><mechanism>SCRAM-SHA-1</mechanism><mec hanism>DIGEST-MD5</mechanism><mechanism>PLAIN</mechanism></mechanisms><c xmlns='http://jabber.org/protocol/caps' hash='sha-1' node='http://www.process-one.net/en/ejabberd/' ver='TQ2JFyRoSa70h2G1bpgjzuXb2sU='/><register xmlns='http://jabber.org/features/iq-register'/></stream:features>

10-24 16:30:55.559 21033-21070/com.demo.xmppchat D/SMACK﹕ SENT (0): <starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'></starttls>

10-24 16:30:55.629 21033-21071/com.demo.xmppchat D/SMACK﹕ RCV (0): <proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>

10-24 16:30:55.769 21033-21071/com.demo.xmppchat W/AbstractXMPPConnection﹕ Connection closed with error

javax.net.ssl.SSLHandshakeException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.

at com.android.org.conscrypt.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.ja va:409)

at com.android.org.conscrypt.OpenSSLSocketImpl$SSLInputStream.<init>(OpenSSLSocket Impl.java:661)

at com.android.org.conscrypt.OpenSSLSocketImpl.getInputStream(OpenSSLSocketImpl.ja va:632)

at org.jivesoftware.smack.tcp.XMPPTCPConnection.initReaderAndWriter(XMPPTCPConnect ion.java:661)

at org.jivesoftware.smack.tcp.XMPPTCPConnection.proceedTLSReceived(XMPPTCPConnecti on.java:768)

at org.jivesoftware.smack.tcp.XMPPTCPConnection.access$1000(XMPPTCPConnection.java :132)

at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.parsePackets(XMPPTCPC onnection.java:1068)

at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.access$200(XMPPTCPCon nection.java:969)

at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader$1.run(XMPPTCPConnecti on.java:988)

Caused by: java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.

at com.android.org.conscrypt.TrustManagerImpl.checkTrusted(TrustManagerImpl.java:2 82)

at com.android.org.conscrypt.TrustManagerImpl.checkServerTrusted(TrustManagerImpl. java:202)

at com.android.org.conscrypt.OpenSSLSocketImpl.verifyCertificateChain(OpenSSLSocke tImpl.java:611)

at com.android.org.conscrypt.NativeCrypto.SSL_do_handshake(Native Method)

at com.android.org.conscrypt.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.ja va:405)