W850i java not working

What I am feeling here is the application you downloaded is not made for this phone format. This would cause this type of error.
Sure it runs JAVA granted but not all java programs work on this phone, can you be a little more specific on the name of the application?
But what it seems is that the program is not compatable.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

This error occurs when your phone is checking the signature of a digitally signed java application and there is no match or is unable to do so. The most common cause is that the signature is expired. Try setting the date backwards on your phone - let's say one or two month :-) and have a look! I bet it works now....

Actually, just got my back today from repair. Called Sony ericsson about the problem and they told me to send it in for repair. 'Cause it's under warranty (Which I wasn't asked if it was) I also went ahead and asked about the broken keypad. it took less than two weeks. Had to use my old s710. So far I have not been able to find a solution. Maybe flashing the phone could help. I think that's what they did. Because it looks like it came from SE instead of Att.

it depends on which java games you are downloading try .jad files if the .jar files are not working with your phone.

if you have manufacturers gaurantee take it back to the store of purchase may well be a virus or corrupt file on memory card try reformat memory card.

Naz.kklso

CANT GET IN TO APPLICATIONS AND GAMES ERROR MESSAGE FAILED OPERATION. HAD THE SAME PROBLEM WITH W850I, K800I AND K850I IT IS ANNOYING.

CONTACTED PHONE PROVIDER AND THEY UPDATED THE SOFTWARE
AND WAS WORKING FINE AFTER THAT

that was on another page, hope it helps

Reinstall the Firmware or updating to the latest software from S.e 's site.
that must be then some hardcore java errors?

i understand ur problem , but it has been very frequently noticed that most of the application available on net are not compatible with Sony Erricsson handsets...plz make sure that the apps u r trying to install are compatible for ur phone , it is a clear java version mismatch... 

i understand ur problem , but it has been very frequently noticed that most of the application available on net are not compatible with Sony Erricsson handsets...plz make sure that the apps u r trying to install are compatible for ur phone , it is a clear java version mismatch...

a lot of people have that problem, try updating your software

CANT GET IN TO APPLICATIONS AND GAMES ERROR MESSAGE FAILED OPERATION. HAD THE SAME PROBLEM WITH W850I, K800I AND K850I IT IS ANNOYING.

CONTACTED PHONE PROVIDER AND THEY UPDATED THE SOFTWARE
AND WAS WORKING FINE AFTER THAT