Must you have 32-bit version of java, or may be you have both version [32-bit 64-bit] of java on same computer.
Make sure you have 32-bit version then must you specify the version that using in Aptana studio to do this :
1-Go to apatana folder and find the AptanaStudio3.ini file
“C:\Users\[YourUser]\AppData\Roaming\Appcelerator\Aptana Studio”
2- Add the java 32-bit version path to AptanaStudio3.ini using notepad
