Application works no WTK but not on phone

I created a very simple application, with a form, some textfields, nothing fancy, no images, no menus, etc.
It works fine on the WTK simulator, and it installs on the phone, but when I execute it I get "Application Error" and it doesn't even open.
I'm manually creating the JAR file... is there anything I should add to it? I'm using the manifest file created by WTK and the class file (only one).

Hey thanks mate.
I have posted my code in other thread if you would like to have a look at it.
I m using 3G to access my webserver. Oh yeah, I m using pure HTTP and not WAP-HTTP since I have changed the configuration.
But, as I said previously I had no problems doing the samething from the same device although I didnt send any data, just something like pinging the web server and getting a reply in form of say " works1","works2" and so on....
Ok, I will have a look at device config. data sheet.
Thanks for your reply

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I have been trying to build this application and avail users to download it from a WAP page.
Now, initially for testing purpose I managed to transfer it on my mobile device which is a Sony Ericsson Z800 using a data cable.
The application downloads 2 images from an Apache Tomcat web server and displays it on user screen. I have created this application using MIDP 2.0. I managed to install it on my mobile device and now when I m trying to send request to the server I wont get any response ? The request itself is not reaching to the web server.
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Hey thanks mate.
I have posted my code in other thread if you would like to have a look at it.
I m using 3G to access my webserver. Oh yeah, I m using pure HTTP and not WAP-HTTP since I have changed the configuration.
But, as I said previously I had no problems doing the samething from the same device although I didnt send any data, just something like pinging the web server and getting a reply in form of say " works1","works2" and so on....
Ok, I will have a look at device config. data sheet.
Thanks for your reply

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