Empty IMU measurements vector!!!

[ALFONSOBUGRA]

I ran successfully on my own dataset in a monocular scenario.
But when I try to run monocular-inertial scenario on my own dataset, I get errors.

IMU: 200Hz
Images: 20Hz
Camera type: Pinhole
Imu calibration params: default values of EuRoC dataset
Timestamps: IMU and images start at the same time then match certain periods.
Fail to track local map! IMU is not recently initialized. Reseting active map... SYSTEM-> Reseting active map in monocular case LM: Active map reset received LM: Active map reset waiting... LM: End reseting Local Mapping... LM: Reset free the mutex LM: Active map reset, Done!!! mnFirstFrameId = 38 mnInitialFrameId = 0 New map created with 68 points Empty IMU measurement vector!!!

Above errors are repeated periodically.

How can I solve it? I received these errors when i run without ros. After this, I tried that calibrate Zed camera and IMU then use a rosbag file to run but i received take errors again like that:

Error: Frame with a timestamp older than previous frame detected.
Map point vector is empty.
TimeStamp jump detected, before IMU initialization.

What should i do solve these problems? How can i run ZED camera on mono-inertial mode?