MPU6050 + nrf52-quadcopter example - hangs on initialization

Hello,

I'm using the nrf52-quadcopter example from NordicPlayground.
After successfully building the project and connecting the MPU6050 , I got a hang during sensor initialization at "Waiting for FIFO count > 2...".
The hang occurs at call  mpu6500GetFIFOCount() from MPU6050_6Axis_MotionApps20.c

I'm trying to figure out the problem, but I don't understand its cause.
Any help is welcome!

Thanks in advance,

Log

Reading FIFO count.CurrenResetting FIFO...
Enabling FIFO...
Enabling DMP...
Resetting DMP...
Writing final memory update 3/7 (function unknown)...
Block write verification error, bank 1, address 106!
Expected:       06      00
Received:       09      23
Writing final memory update 4/7 (function unknown)...
Block write verification error, bank 1, address 96!
Expected:       00      00      00      00      00      00      00      00
Received:       09      23      a1      35      38      97      d8      d8
Writing final memory update 5/7 (function unknown)...
Block write verification error, bank 0, address 96!
Expected:       40      00      00      00
Received:       09      23      a1      35
Waiting for FIFO count > 2...

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