(solved) Da Vinci Resolve doesn't start

Hi everyone,
I installed Da Vinci Resolve 15.01 on my iMac 27" late 2009 with OS X 10.13.6 and 8 Gb ram for the first time. When I launch it, I got the splash screen but the starting is blocked at "Loading Waveform monitor". I have to force quit it.
What is the pb ? What to do ?
Thanks.
I installed Da Vinci Resolve 15.01 on my iMac 27" late 2009 with OS X 10.13.6 and 8 Gb ram for the first time. When I launch it, I got the splash screen but the starting is blocked at "Loading Waveform monitor". I have to force quit it.
What is the pb ? What to do ?
Thanks.