Hello Arth,
I highly suggest you try our newest KSDK2.X for KL26.
Please download the KSDK2.3_FRDM_KL26Z from this link:
Welcome | MCUXpresso SDK Builder
Select the board as FRDM-KL26, then generate the code and download it, you can try to add other file, if you still have problem about it, please let me know.
SDK1.3 is very old, we won't update that package even it has bugs.
Have a great day,
Kerry
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------