Can't call a class method from an external dll file

[PrettySneaky]

I have bumbed into a frustrating problem with my webservice. When I run
he web site in Visual studio 2005 everything works fine. But when i try
to publish it, it seems to be unable to call a method from an external
dll file. When I mean external dll file I simply mean it's dll which I
have not written and I use as an reference (not a web reference) in my
VS solution.

When I call my webservice from my javascript code that callback
function return this error message. I have confirmed that the webmethod
is terminated at the moment one of the methods from my external dll is
called.

Anyone know what I might have done wrong?

---------------------------
Microsoft Internet Explorer
---------------------------
Error:

soap:Server

System.Web.Services.Protocols.SoapException: Server was unable to
process request. ---> System.NullReferenceException: Object reference
not set to an instance of an object.
at OpcClientPrototype.CreateTagSubsription(String[] tags)
at OpcClientPrototype.GetDucData(String[] _tags)
--- End of inner exception stack trace ---
---------------------------
OK
---------------------------

[S.M. Altaf [MVP]]

Is it a .NET DLL or a COM DLL? If it's a .NET DLL, have you published the
DLL to wherever you are hosting it?

If it is a COM DLL, you'll need to have the DLL registered on the hosting
server.

HTH
Altaf
--------------------------------------------------------------------------------
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"PrettySneaky" <Pr**********@gmail.com> wrote in message
news:11**********************@o13g2000cwo.googlegr oups.com...

I have bumbed into a frustrating problem with my webservice. When I run
he web site in Visual studio 2005 everything works fine. But when i try
to publish it, it seems to be unable to call a method from an external
dll file. When I mean external dll file I simply mean it's dll which I
have not written and I use as an reference (not a web reference) in my
VS solution.

When I call my webservice from my javascript code that callback
function return this error message. I have confirmed that the webmethod
is terminated at the moment one of the methods from my external dll is
called.

Anyone know what I might have done wrong?

---------------------------
Microsoft Internet Explorer
---------------------------
Error:

soap:Server

System.Web.Services.Protocols.SoapException: Server was unable to
process request. ---> System.NullReferenceException: Object reference
not set to an instance of an object.
at OpcClientPrototype.CreateTagSubsription(String[] tags)
at OpcClientPrototype.GetDucData(String[] _tags)
--- End of inner exception stack trace ---
---------------------------
OK
---------------------------

[PrettySneaky]

I think it's an .NET dll. It's called TsOpcNet.dll.. And I'm not able
to register it with regsvr32.

I think it's registered on the hosting server since I use the publish
command i Visual studio 2005 to publish it. The dll is in the same
folder as my webservice so it should be able run anything on the dll
file. One other strange thing is that I'm able to declare datatypes
which are defined in the external dll file and even use the new
operator and create objects of diferent types. I mean, the webservice
should crash when i call the constructor on the object..

When I think of it. The error har probably nothing to do with the dll
file. I think something is going wrong when i use the webservice
outside the developer environment..

thanx for your quick reply