Invalid class object

Some are experiencing issues with version 77 of the Abstract app where—when they try to open a file in Abstract—this error is thrown:

Could not open file: edit: Invalid object class color found in archive.

To workaround this issue:

  1. Quit Abstract.
  2. Download the newest Abstract build.
  3. Unzip and install the new build.

If you’re still seeing the error after installing the new build:

  1. Download the script below. You can use it to clear your Sketch cache.
  2. Unzip and run the cache-clearing script in Terminal.
  3. Once finished, open Abstract and open the file that originally threw the error message.