git submodule update --init --recursive
Submodule 'modules/PX4Firmware' (git://github.com/MY_GITHUB_ACCOUNT/PX4Firmware.git) registered for path 'modules/PX4Firmware'
Submodule 'modules/PX4NuttX' (git://github.com/MY_GITHUB_ACCOUNT/PX4NuttX.git) registered for path 'modules/PX4NuttX'
Submodule 'modules/gbenchmark' (git://github.com/MY_GITHUB_ACCOUNT/benchmark.git) registered for path 'modules/gbenchmark'
Submodule 'gtest' (git://github.com/MY_GITHUB_ACCOUNT/gtest) registered for path 'modules/gtest'
Submodule 'modules/mavlink' (git://github.com/MY_GITHUB_ACCOUNT/mavlink) registered for path 'modules/mavlink'
Submodule 'modules/uavcan' (git://github.com/MY_GITHUB_ACCOUNT/uavcan.git) registered for path 'modules/uavcan'
Submodule 'modules/waf' (git://github.com/MY_GITHUB_ACCOUNT/waf.git) registered for path 'modules/waf'
Cloning into 'D:/repo/gd_ardupilot/modules/PX4Firmware'...
Cloning into 'D:/repo/gd_ardupilot/modules/PX4NuttX'...
Cloning into 'D:/repo/gd_ardupilot/modules/gbenchmark'...
Cloning into 'D:/repo/gd_ardupilot/modules/gtest'...
Cloning into 'D:/repo/gd_ardupilot/modules/mavlink'...
Cloning into 'D:/repo/gd_ardupilot/modules/uavcan'...
Cloning into 'D:/repo/gd_ardupilot/modules/waf'...
Submodule path 'modules/PX4Firmware': checked out '0384802e81330751f39550a0804357d8b04f278a'
Submodule 'Tools/gencpp' (https://github.com/ros/gencpp.git) registered for path 'modules/PX4Firmware/Tools/gencpp'
Submodule 'Tools/genmsg' (https://github.com/ros/genmsg.git) registered for path 'modules/PX4Firmware/Tools/genmsg'

*****************************************************************************************************
The following is the line when the problem arises: I'm trying to point the submodule mavlink/include/mavlink/v1.0
to my fork instead of the original repo

Submodule 'mavlink/include/mavlink/v1.0' (git://github.com/mavlink/c_library.git) registered for path
 'modules/PX4Firmware/mavlink/include/mavlink/v1.0'
*****************************************************************************************************

Submodule 'src/lib/DriverFramework' (https://github.com/PX4/DriverFramework.git) registered for path 'modules/PX4Firmware/src/lib/DriverFramework'
Submodule 'src/lib/ecl' (https://github.com/PX4/ecl.git) registered for path 'modules/PX4Firmware/src/lib/ecl'
Submodule 'src/lib/matrix' (https://github.com/PX4/Matrix.git) registered for path 'modules/PX4Firmware/src/lib/matrix'
Submodule 'src/modules/uavcan/libuavcan' (git://github.com/UAVCAN/libuavcan.git) registered for path 'modules/PX4Firmware/src/modules/uavcan/libuavcan'