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An error uncaught exception Java.lang.IllegalArgumentException

One of my clients has a BlackBerry 9000 device with O/S version Sometime when he tries to use Black Berry Messenger he keeps receiving an error uncaught exception Java.lang.IllegalArgumentException and then he can not get in. Some other time he does not receive any error message when he use BBM and he can log in without any problem. Is anybody knows what causing this error message and how to resolve it?
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3 Solutions
Your best bet to resolve is to update the bb device to the latest version of the bb OS for your model from your carrier's website.  This is an error that can occur for a variety of reasons.
Gary CutriData & Communications SpecialistCommented:
Hi, any version of firmware below has a large number of issues so you need to upgrade ASAP if you carrier offers an update.  Here is a list of all the carrier firmware update pages: http://na.blackberry.com/eng/support/downloads/download_sites.jsp

If your carrier doesn't offer an updated firmware version you can download the latest version from another carrier (e.g. Vodafone UK has and then follow these instructions:

1. Download and install the latest firmware onto your PC running BlackBerry Desktop Manager
2. Go to c:\Program Files\Common Files\Research In Motion\Apploader and delete the vendor.xml file
3. If you are running Desktop Manager 4.7 disconnect your computer from the internet
4. Connect your device to the PC via USB
5. Open BlackBerry Desktop Manager and once your device is detected it will check for updates
6. Once the new firmware is located select "Upgrade Now"
7. Follow the prompts to upgrade your device.
Gary CutriData & Communications SpecialistCommented:
P.S. Most Java errors can be at least temporarily resolved by performing a hard reset (remove the battery).
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