PIC32MZ EC Starter Kit : DRV PHY init failed: -1 after reset (mickael9)

Hi, I'm using the PIC32 MZ Ethernet Starter Kit and I have this problem where the Ethernet PHY initialization fails :DRV PHY init failed: -1
TCP/IP Stack Initialization failed: 0x0 - Aborting! This only happens after a reset, it works fine on power o..