hi i saw you first used " fsl-yocto-8mp-5-15 " , suddenly
u changed to "imx-yocto-bsp-L5-15-5"
sometimes this issue caused by other files in yocto between two builds two folders :
i means can you totally delete all old files , and create new folder ,open new terminal , new repo sync and build it again , shld be ok.
Best Regards,
Joseph Zhou Jianhui / Senior Embedded Software Engineer, Singapore