# Unable to start vehicle not ready (mission plan mode)

**URL:** <https://discuss.px4.io/t/unable-to-start-vehicle-not-ready-mission-plan-mode/9088>\
**Category:** Uncategorized\
**Created:** [January 3, 2019, 7:21am UTC](https://discuss.px4.io/t/unable-to-start-vehicle-not-ready-mission-plan-mode/9088 "2019-01-03T07:21:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![acpl00](https://discuss.px4.io/letter_avatar_proxy/v4/letter/a/9dc877/32.png) [@acpl00](https://discuss.px4.io/u/acpl00)\
**Post date:** [January 3, 2019, 7:21am UTC](https://discuss.px4.io/t/unable-to-start-vehicle-not-ready-mission-plan-mode/9088/1 "2019-01-03T07:21:45Z")

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Hi every one

- First at all, thank you for your kindly help 🙂

Secondly: I have a tbs-discobery drone with a pixhawk and a 3DR/compass gps. I follow this link:

> **[NVIDIA-AI-IOT/redtail](https://github.com/NVIDIA-AI-IOT/redtail/wiki/Skypad-TBS-Discovery-Setup)**
>
> Perception and AI components for autonomous mobile robotics. - NVIDIA-AI-IOT/redtail

- Secondly:  
Well, I read that USB3 is known to be an effective GPS jamming source. So, I have wrapped under the GPS and between the USB3 from Jetson TX2. And, amazingly The GPS status was as follows:

GPS Count 17  
GPS lock 3D DGPS lock  
HDOP 0.7  
VDOP 1.1  
Course over ground 219.4

However, when I set up or add way points in mission plan. I could successfully load the mission and when I wanted to start the mission I got the error:

““Unable to start vehicle not ready”” Even though I tried few times just one log file is available.

I read that the log files only generates when the drone is armed and disarmed, right? well, in that case I armed and disarmed the drone once with the RC-controller.

But, the question is: How can get the log file if it does not allow me to arm and start the mission planer flight mode.

I have the link that has been generated by the flight review.

I share it here:

[https://logs.px4.io/plot\_app?log=25769059-3f72-4431-bc6e-fd072442d7de](https://logs.px4.io/plot_app?log=25769059-3f72-4431-bc6e-fd072442d7de)

Also, after I loaded the first mission plan and failed. I set up new mission plan and then when I wanted to load the way points mission, I got the error: ““Mission write failed to send final ack.””

I am looking forward to your replay.