I'm sorry to hear that this problem occurs! 
When does the game crash exactly? Do you see the loadingscreen? Do you reach the main menu? Does the crash only occurs if you start loading a world?
Is there an "errorlog" or "hs_err_pid" in the game directory after it crashes? If it is, it would be very helpful for us if you can upload it here.
Do you have 64-Bit Java installed? You can see it when going to your system "control panel" -> "programs" and then having a look at "Java". If only 32-Bit is installed, it's labeled as "Java (32-Bit)".
If you have 64-Bit Java, and no errorlog is created, you may try out the "concept-x86.exe". Usually, this one is for 32-Bit OS only, but should also work for 64-Bit OS.
//Edit: Once again I was too slow 
Good work that you found the reason on your own!
Usually the launcher should display a warning dialog if only 32-Bit Java is installed on a 64-Bit OS. Was there no warning? 
Display MoreI'm sorry to hear that this problem occurs!
When does the game crash exactly? Do you see the loadingscreen? Do you reach the main menu? Does the crash only occurs if you start loading a world?
Is there an "errorlog" or "hs_err_pid" in the game directory after it crashes? If it is, it would be very helpful for us if you can upload it here.
Do you have 64-Bit Java installed? You can see it when going to your system "control panel" -> "programs" and then having a look at "Java". If only 32-Bit is installed, it's labeled as "Java (32-Bit)".
If you have 64-Bit Java, and no errorlog is created, you may try out the "concept-x86.exe". Usually, this one is for 32-Bit OS only, but should also work for 64-Bit OS.
//Edit: Once again I was too slow
Usually the launcher should display a warning dialog if only 32-Bit Java is installed on a 64-Bit OS. Was there no warning?
there was one at start but after the launcher has started but that error message didn't mention its was missing Java 64 bit just out of memory - maybe a better message to say its needs java 64 - that's was odd
We have no influence on the second error message you got, since any error that occurs may have different reasons. Also, there are several possible errors that may occur when 32-Bit Java is installed on a 64-Bit OS: On some machines the game runs fine, on other machines the game crashes when loading a world, and on others it already crashes when starting the game. Furthermore, an errormessage is not always shown, that's the reason we give the hint when launching the game
This should be the first message you receive when launching the game and an incorrect java version is installed:
We have no influence on the second error message you got, since any error that occurs may have different reasons. Also, there are several possible errors that may occur when 32-Bit Java is installed on a 64-Bit OS: On some machines the game runs fine, on other machines the game crashes when loading a world, and on others it already crashes when starting the game. Furthermore, an errormessage is not always shown, that's the reason we give the hint when launching the game
This should be the first message you receive when launching the game and an incorrect java version is installed:
yes that one appeared but i didn't realise but its all sorted now
yes that one appeared but i didn't realise but its all sorted now
Okay, I was just afraid that the dialog perhaps didn't pop up, since this feature was first introduced in the latest update
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