Weird error while opening oracle session

Question

Hello everyone,
I testing Oracle.ManagedDataAccess 4.121.1.0 with .Net console application and powershell script. All is fine in .Net console application but in my powerhell script i have a strange issue while i trigger the open method.
My PS script
Add-Type -Path 'C:\oracle\Oracle.ManagedDataAccess.dll'
$CNX = "Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(COMMUNITY=tcp.world)(PROTOCOL = TCP)(Host = MY_HOST)(Port = 1521)))(CONNECT_DATA=(SID=MY_SID)));User ID=USER$MES;Password=PWD;"  
$con = New-Object Oracle.ManagedDataAccess.Client.OracleConnection("$CNX")
try
    $con.open()
    "Connected to database: {0} running on host: {1} - Servicename: {2} - Serverversion: {3}" -f `
    $con.DatabaseName, $con.HostName, $con.ServiceName, $con.ServerVersion
catch
    Write-Error ("Can't open connection: {0}`n{1}" -f $con.ConnectionString, $_.Exception.ToString())
finally
    if ($con.State -eq 'Open') { $con.close() }
I have the following error 
Write-Error : Can't open connection: Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(COMMUNI
TY=tcp.world)(PROTOCOL = TCP)(Host = MY_HOST)(Port = 1521)))(CONNECT_DATA=(SID=MY_SID)));U
ser ID=USER;Password=PWD;
System.Management.Automation.MethodInvocationException: Exception lors de l'appel de « Open »
avec « 0 » argument(s) : « Impossible de trouver l'assembly 'Oracle.ManagedDataAccess, Versi
on=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342'. » ---> System.Runtime.Serial
ization.SerializationException: Impossible de trouver l'assembly 'Oracle.ManagedDataAccess, V
ersion=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342'.
   à OracleInternal.ConnectionPool.PoolManager`3.CreateNewPR(Int32 reqCount, Boolean bForPool
Population, ConnectionString csWithDiffOrNewPwd, String instanceName)
   à OracleInternal.ConnectionPool.PoolManager`3.Get(ConnectionString csWithDiffOrNewPwd, Boo
lean bGetForApp, String affinityInstanceName, Boolean bForceMatch)
   à OracleInternal.ConnectionPool.OraclePoolManager.Get(ConnectionString csWithNewPassword,
Boolean bGetForApp, String affinityInstanceName, Boolean bForceMatch)
   à OracleInternal.ConnectionPool.OracleConnectionDispenser`3.Get(ConnectionString cs, PM co
nPM, ConnectionString pmCS, SecureString securedPassword, SecureString securedProxyPassword)
   à Oracle.ManagedDataAccess.Client.OracleConnection.Open()
   à Open(Object , Object[] )
   à System.Management.Automation.DotNetAdapter.AuxiliaryMethodInvoke(Object target, Object[]
arguments, MethodInformation methodInformation, Object[] originalArguments)
   --- Fin de la trace de la pile d'exception interne ---
   à System.Management.Automation.StatementListNode.ExecuteStatement(ParseTreeNode statement,
Array input, Pipe outputPipe, ArrayList& resultList, ExecutionContext context)
   à System.Management.Automation.StatementListNode.Execute(Array input, Pipe outputPipe, Arr
ayList& resultList, ExecutionContext context)
   à System.Management.Automation.TryStatementNode.Execute(Array input, Pipe outputPipe, Arra
yList& resultList, ExecutionContext context)
Au niveau de C:\\oracle\oracle.ps1 : 19 Caractère :
20
+         Write-Error <<<<  ("Can't open connection: {0}`n{1}" -f $con.ConnectionString, $_.E
xception.ToString())
    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Microsoft.Po
   werShell.Commands.WriteErrorCommand
Any ideas how to fix that issue?
Thanks,
Nicolas

Answer 1

Hitesh,
I see this error in the log ..
=============================================
Exception occurred: java.sql.SQLException: Listener refused the connection with the following error:
ORA-12514, TNS:listener does not currently know of service requested in connect descriptor
=============================================
Please verify that you have proper entry in the hosts file and that your listener is up and running. Also, please verify that the database is open and no errors can be found in the database log file.
TroubleShooting Guide For ORA-12514 TNS:listener could not resolve SERVICE_NAME given in connect descriptor [ID 444705.1]
Thanks,
Hussein