The remote procedure call failed. (Exception from HRESULT: 0x800706BE)

Hi Team,
I am using Windows Server 2008 SP2 IIS 7.0 .net framework 4.5.
Am Getting the following Exception Error.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 
Exception Details: System.Runtime.InteropServices.COMException: The remote procedure call failed. (Exception from HRESULT: 0x800706BE)
Source Error:
Line 870:            Excel.Workbook oWB = oXL.Workbooks.Open(workbookPath, 0, true, 5, "", "", true, Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, true, true);
Source File:  D:\testpath\filename.aspx    Line:  870 
Stack Trace:
[COMException (0x800706be): The remote procedure call failed. (Exception from HRESULT: 0x800 ...