電子レセプトを実行すると下記エラーが発生して実行できませんでした。
対処法あれば宜しくお願いします。

Version:20150602版
System.ArgumentNullException: 値を Null にすることはできません。
パラメーター名:input
場所 System.Text.RegularExpressions.Regex.Replace(String input, String replacement)
場所 System.Text.RegularExpressions.Regex.Replace(String input, String pattern, String replacement)
場所 RPPMAN.Util.CalcPassword(都道府県コード KENcode, String ykkcode)
場所 RPPMAN.Views.MainMenuForm.CheckPassword()
場所 RPPMAN.Views.MainMenuForm.buttonCALCCSV_Click(Object sender, EventArgs e)
場所 System.Windows.Forms.Control.OnClick(EventArgs e)
場所 System.Windows.Forms.Button.OnClick(EventArgs e)
場所 System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
場所 System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
場所 System.Windows.Forms.Control.WndProc(Message& m)
場所 System.Windows.Forms.ButtonBase.WndProc(Message& m)
場所 System.Windows.Forms.Button.WndProc(Message& m)
場所 System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
場所 System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
場所 System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
RPPMAN, Version=2.99.5631.2031, Culture=neutral, PublicKeyToken=null
System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Deployment, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Deployment.resources, Version=4.0.0.0, Culture=ja, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.VisualBasic, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Transactions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.EnterpriseServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Numerics, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Data.DataSetExtensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Interop.JRO, Version=2.6.0.0, Culture=neutral, PublicKeyToken=null
mscorlib.resources, Version=4.0.0.0, Culture=ja, PublicKeyToken=b77a5c561934e089
System.Windows.Forms.resources, Version=4.0.0.0, Culture=ja, PublicKeyToken=b77a5c561934e089
Accessibility, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
WindowsFormsIntegration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
System.Xaml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089