Uboot doesn't load overlay files

Another problem I am having with uboot is that it refuses to load overlay files.
When I run the following command :
setenv load_addr $ramdisk_addr_r
fatload mmc 1:1 ${load_addr} rockchip/overlays/${overlay_file}.dtbo
fdt apply ${load_addr}

I get the following output in uboot :
failed on fdt_overlay_apply(): FDT_ERR_NOTFOUND

overlays are now loading when using the cm3 io board : https://github.com/flatmax/buildroot.rockchip/blob/master/configs/cm3_defconfig

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