Mac:
"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.8.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.9.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.10.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.11.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.12.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.13.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.14.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.15.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.16.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.17.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.18.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.19.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.20.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.21.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.22.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.23.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.24.plist PlayerDebugMode 1"

"defaults write /Users/<username>/Library/Preferences/com.adobe.CSXS.25.plist PlayerDebugMode 1"

or

Go to terminal and write 

com.adobe.CSXS.8.plist PlayerDebugMode 1
com.adobe.CSXS.9.plist PlayerDebugMode 1
com.adobe.CSXS.10.plist PlayerDebugMode 1
com.adobe.CSXS.11.plist PlayerDebugMode 1
com.adobe.CSXS.12.plist PlayerDebugMode 1
com.adobe.CSXS.13.plist PlayerDebugMode 1
com.adobe.CSXS.14.plist PlayerDebugMode 1
com.adobe.CSXS.15.plist PlayerDebugMode 1
com.adobe.CSXS.16.plist PlayerDebugMode 1
com.adobe.CSXS.17.plist PlayerDebugMode 1
com.adobe.CSXS.18.plist PlayerDebugMode 1
com.adobe.CSXS.19.plist PlayerDebugMode 1
com.adobe.CSXS.20.plist PlayerDebugMode 1
com.adobe.CSXS.21.plist PlayerDebugMode 1
com.adobe.CSXS.22.plist PlayerDebugMode 1
com.adobe.CSXS.23.plist PlayerDebugMode 1
com.adobe.CSXS.24.plist PlayerDebugMode 1
com.adobe.CSXS.25.plist PlayerDebugMode 1

Press Enter 

Restart After Effect.  