# Failure of PX4 plane code running **URL:** \ **Category:** Uncategorized\ **Created:** [May 31, 2017, 9:20pm UTC](https://discuss.px4.io/t/failure-of-px4-plane-code-running/3436 "2017-05-31T21:20:52Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![paan2097](https://discuss.px4.io/user_avatar/discuss.px4.io/paan2097/32/4697_2.png) [@paan2097](https://discuss.px4.io/u/paan2097)\ **Post date:** [May 31, 2017, 9:20pm UTC](https://discuss.px4.io/t/failure-of-px4-plane-code-running/3436/1 "2017-05-31T21:20:52Z")
I’m trying to run PX4 on navio2 and I’m getting this text output as well as the servos trying to over extend and making a horrible noise. The servo failure noise happens directly after ekf2 start in the .config file. Here is the output: commands file: ./posix-configs/rpi/px4\_fw.config * * * | \_\_\_ \ \ \ / / / | | |_/ / \ V / / /| | | \_\_/ / \ / /_| | | | / /^\ \ \_\_\_ | \_| / / |\_/ px4 starting. INFO [dataman] Unkown restart, data manager file ‘rootfs/fs/microsd/dataman’ size is 11797680 bytes ERROR [drivers\_\_linux\_gpio] read 4: open: No such file or directory (2) ERROR [drivers\_\_linux\_gpio] export failed: write: Device or resource busy (16) ERROR [navio\_rgbled] red led: failed to export ERROR [drivers\_\_linux\_gpio] unexport 4: write: Invalid argument (22) ERROR [drivers\_\_linux\_gpio] unexport 27: write: Invalid argument (22) ERROR [drivers\_\_linux\_gpio] unexport 6: write: Invalid argument (22) Command ‘navio\_rgbled’ failed, returned -1 WARN [commander] Buzzer: px4\_open fail WARN [commander] Buzzer init failed WARN [commander] Preflight checks always pass on RPI. . . INFO [mavlink] mode: Normal, data rate: 1000000 B/s on udp port 14556 remote port 14550 Sleeping for 1 s; (1000000 us). INFO [logger] logger started (mode=all) pxh\> INFO [mavlink] using network interface eth0, IP: 10.0.18.10 INFO [mavlink] with broadcast IP: 10.0.18.255 INFO [navio\_sysfs\_pwm\_out] Loaded mixer from file ROMFS/px4fmu\_common/mixers/AERT.main.mix INFO [lib\_\_ecl] EKF aligned, (pressure height, IMU buf: 17, OBS buf: 16) Exiting… ÿShutting down Restoring terminal ---
**Author:** ![sigi0073](https://discuss.px4.io/letter_avatar_proxy/v4/letter/s/bc79bd/32.png) [@sigi0073](https://discuss.px4.io/u/sigi0073)\ **Post date:** [June 1, 2017, 1:57am UTC](https://discuss.px4.io/t/failure-of-px4-plane-code-running/3436/2 "2017-06-01T01:57:31Z")
Oh, I just posted on another post you made, but I see you have the output here. Did you make your raspberry pi image using the Emlid image linked in the development-guide? Or did you set up your own image for the pi? – Sid ---
**Author:** ![paan2097](https://discuss.px4.io/user_avatar/discuss.px4.io/paan2097/32/4697_2.png) [@paan2097](https://discuss.px4.io/u/paan2097)\ **Post date:** [June 1, 2017, 2:20pm UTC](https://discuss.px4.io/t/failure-of-px4-plane-code-running/3436/3 "2017-06-01T14:20:19Z")
Thanks for the responses. I most likely cloned the master branch, but I will try the stable branch today thanks for the advice. We set everything up according to the PX4 devguide and emlid instructions for image. ---
**Author:** ![paan2097](https://discuss.px4.io/user_avatar/discuss.px4.io/paan2097/32/4697_2.png) [@paan2097](https://discuss.px4.io/u/paan2097)\ **Post date:** [June 1, 2017, 3:40pm UTC](https://discuss.px4.io/t/failure-of-px4-plane-code-running/3436/4 "2017-06-01T15:40:43Z")
Stable image still caused the same erros along with the servo over extension. ---
**Author:** ![paan2097](https://discuss.px4.io/user_avatar/discuss.px4.io/paan2097/32/4697_2.png) [@paan2097](https://discuss.px4.io/u/paan2097)\ **Post date:** [June 1, 2017, 5:01pm UTC](https://discuss.px4.io/t/failure-of-px4-plane-code-running/3436/5 "2017-06-01T17:01:15Z")
I can stop the servo extension noise but commenting out the ekf2 line or this line in the posix-configs/rpi/px4\_fw.config file: navio\_sysfs\_pwm\_out start -m ROMFS/px4fmu\_common/mixers/AERT.main.mix How can I set the mixer so we don’t get over extension of the servos? ---
**Author:** ![sigi0073](https://discuss.px4.io/letter_avatar_proxy/v4/letter/s/bc79bd/32.png) [@sigi0073](https://discuss.px4.io/u/sigi0073)\ **Post date:** [June 2, 2017, 12:09am UTC](https://discuss.px4.io/t/failure-of-px4-plane-code-running/3436/6 "2017-06-02T00:09:29Z")
Hi there, So if you navigate to the directory ROMFS/px4fmu\_common/mixers/ and take a look at the README.md file there, it provides documentation about the mixer. I recommend reading that file as well as the comments in AERT.main.mix, but if you change the last two constants on the lines that start with `O:` (lower and upper limits) on the offending servos, you should be able to keep your servos within their proper ranges.