There are 2 possible causes:
    1. You have 32-bit java installed;
    2. Java ran out of memory space (this is usually caused by the above-mentioned problem).   How to analyze the problem: Windows:
    Step 1: Open a new command prompt (cmd)
    Step 2: In this window type "java -version" and press enter
    Step 3: Analyze the output
    If it contains the words "32-bit" anywhere in this message it means you have 32-bit java installed.  Mac:
    Step 1: Open a new terminal window
    Step 2: In this window type "java -version" and press enter
    Step 3: Analyze the output
    If it contains the words "32-bit" anywhere in this message it means you have 32-bit java installed.   How to fix the problem: If you have 32-bit java installed, install 64-bit java 8 which can be found here or by googling "java JRE".
MAKE SURE YOU DOWNLOAD AND INSTALL THE 64-BIT VERSION. What if this message does not contain "32-bit" but it does contain "64-bit"?
This means your active java installation is 64-bit which is correct. If the client still crashes for you it means you will need to allocate more memory to the parabot client.     This guide is quite compact at the moment, I will add more in-depth explanations depending on community feedback. So all feedback is welcome!