Processing 1.5.1 "Can't open input server"

Hello, I just downloaded processing 1.5.1 for mac 10.6.8 I watched the video "hello processing" and typed : rect(250, 200, 150, 100);

processing opens a tiny square sketch window without any triangle, and tells me in red at the bottom : "Can't open input server" (in detail : 2018-02-10 16:24:14.723 java[14604:170f] Can't open input server /Library/InputManagers/CTLoader)

what does it mean and what should I do to resolve the problem? thanks!

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