Failed To Locate Reason Engine, Exiting

If you’re having problems accessing Reason 3.0.5 on an Intel Mac after installation and you’re getting the message “failed to locate reason engine, exiting”, every time you try to launch, the likely reason is that your ReWire folder has been set to read only.

You’ll need to change the permissions on the folder to “Read & Write” in order to launch Reason in ReWire mode.

To do this…

  1. Open a Finder window.
  2. Browse your hard drive, going to Library > Application Support > Propellerhead Software.
  3. Control-Click on the ReWire folder and select “Get Info”.
  4. Scroll to the end of the info window and extend the “Ownership & Permissions” (small triangle to the left).
  5. Change the permissions in “you can” to “Read & Write”.

If you can’t change permissions, or the box is greyed out, you’ll need to change the owner (or I did anyway). The default is set to ‘system’, click the lock beside the Owner dropdown and select your username from the menu. You’ll see the permissions box is no longer greyed out. Click the lock to prevent further changes on ownership and set the permissions to “Read & Write”.

Go back to wherever you dragged your original Reason Adapted 3 folder to (I stuck mine in Applications) and launch Reason, problem free.

Author: Ken McGuire

Runs Event Media and The Devious Theatre Company and writes about food at Any Given Food. You'll find me on Twitter here and here.