If you have just re-installed Aptana Studio after uninstalling an older version, and you are getting an error in your log file that looks like the following excerpt, you will need to repair your Aptana installation:

!SESSION 2007-06-05 18:03:17.484 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.6.0_01
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_GB
Framework arguments: C:\Program Files\Aptana\Aptana IDE Beta\Aptana.exe
Command-line arguments: -os win32 -ws win32 -arch x86 C:\Program Files\Aptana\Aptana IDE Beta\Aptana.exe

!ENTRY org.eclipse.core.runtime 2007-06-05 18:03:19.640
!MESSAGE Product com.aptana.ide.rcp.product could not be found.

!ENTRY org.eclipse.osgi 4 0 2007-06-05 18:03:19.671
!MESSAGE Application error
!STACK 1
java.lang.RuntimeException: No application id has been found. 

To repair your Aptana installation:

on Windows:

1. Navigate to the C:\Documents and Settings\Username\Application Data\Aptana\Aptana Studio or C:\Documents and Settings\Username\Application Data\Aptana\Aptana IDE\ folder, and rename the configuration folder under Aptana Studio or Aptana IDE to configuration.bak (or other temporary name).

on OSX:

1. Navigate to the ~/Library/Application Support/Aptana/Aptana Studio or ~/Library/Application Support/Aptana/Aptana IDE folder, and rename the configuration folder under Aptana Studio or Aptana IDE to configuration.bak (or other temporary name).

If that still doesn't work, try the following:

on Windows:

1. Use the Windows control panel Add/Remove Programs utility to uninstall Aptana.
2. Navigate to where the Aptana application was installed, and delete your old plugins folder (and all of its contents).
3. Re-install Aptana Studio.

on OSX:

1. Navigate to where the Aptana application was installed, and delete your old plugins folder (and all of its contents).
2. Re-install Aptana Studio.