SSIS script task failing when deployed as project in SSIS 2012

Question

Yes , it's the classic "my package works inside SSDT but dies when I deploy it". I  have a fairly good idea what the problem is. I have a line of code that looks in a directory. My guess is that the account that is used to run packages out
of SSISDB doesn't have access to the directory in question. My question is, what exactly needs to be set properly in order for packages to run properly in the package deployment model.
Error message: Exception has been thrown by the target of an invocation.
Code:
using System;
using System.Data;
using System.IO;
using Microsoft.SqlServer.Dts.Runtime;
using System.Windows.Forms;
 public void Main()
            String FilePath;
            FilePath = Dts.Variables["InitialDirectoryFullPath"].Value.ToString();
            if (Directory.GetFiles(FilePath).Length == 0)
                Dts.Variables["FilesExist"].Value = false;
            else
                Dts.Variables["FilesExist"].Value = true;
            Dts.TaskResult = (int)ScriptResults.Success;
        enum ScriptResults
            Success = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Success,
            Failure = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Failure

Answer 1

You need to give the account which is executing package the access to the directory. If its from SQL Agent job, it might be using SQL Agent service account by default. Then you've to give it required permissions
Alternatively you can create a proxy account with required permissions and configure the job to use it
http://www.mssqltips.com/sqlservertip/2163/running-a-ssis-package-from-sql-server-agent-using-a-proxy-account/
Also you've not posted error message. Whatever I've suggested is by assuming that its a permission issue. If you can post error message we might be able to confirm on the actual cause of error.
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