My best guess is that it is a permissions problem, either the FS process can’t access the directory or the file itself. Bote From: Grant Bagdasarian Sent: Monday, 23 February, 2015 06:24 Subject: Re: [Freeswitch-users] ESL and Event Socket for .NET Hello, This seems to be a very old thread, but I’m experiencing the same error like the one below. I’m using the ManagedEsl and ESL.dll from 1.4.15. I’ve compiled both myself and they work on my development machine. The application is contained in a Windows Service, and when installed on a production server as a Service, I get the same error “Unable to load DSLL ‘ESL’”…. I ran procmon.exe to see if the application executable could find the ESL.dll, and it could, so I don’t know why this error occurs. Any ideas? Grant From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Ira Tessler Sent: Friday, October 31, 2014 8:19 PM To: FreeSWITCH Users Help Subject: Re: [Freeswitch-users] ESL and Event Socket for .NET Dave - Can you compile a new version? I tried with VS 2013 and get the following error when running my application: System.TypeInitializationException: The type initializer for 'ESLPINVOKE' threw an exception. ---> System.TypeInitializationException: The type initializer for 'SWIGExceptionHelper' threw an exception. ---> System.DllNotFoundException: Unable to load DLL 'ESL': The specified module could not be found. (Exception from HRESULT: 0x8007007E) at ESLPINVOKE.SWIGExceptionHelper.SWIGRegisterExceptionCallbacks_ESL(ExceptionDelegate applicationDelegate, ExceptionDelegate arithmeticDelegate, ExceptionDelegate divideByZeroDelegate, ExceptionDelegate indexOutOfRangeDelegate, ExceptionDelegate invalidCastDelegate, ExceptionDelegate invalidOperationDelegate, ExceptionDelegate ioDelegate, ExceptionDelegate nullReferenceDelegate, ExceptionDelegate outOfMemoryDelegate, ExceptionDelegate overflowDelegate, ExceptionDelegate systemExceptionDelegate) at ESLPINVOKE.SWIGExceptionHelper..cctor() --- End of inner exception stack trace --- at ESLPINVOKE.SWIGExceptionHelper..ctor() at ESLPINVOKE..cctor() --- End of inner exception stack trace --- at ESLPINVOKE.new_ESLconnection__SWIG_3(String jarg1, String jarg2, String jarg3) at ESLconnection..ctor(String host, String port, String password) at CallRecordingEvent.PollEvents.InboundMode(String serverName, String eslPrivateIPAddress, String eslPort, String eslPassword) in c:\Users\ira\Source\Workspaces\Freeswitch\Freeswitch\CallRecordingEvent\PollEvents.cs:line 38 Ira Tessler ira@connectmevoice.com