extract kernel function address fail on lenovo A288T

[askk]

i use this tools to extract kernel function address on lenovo a288t(also on other spreadtrum chips linux kernel, such as lenovo a298t), but i get print message:

GZ compression detected
Unpacking zImage

gzip: stdin: decompression OK, trailing garbage ignored
DONE unpacking zImage
Grabbing addresses
[+]mmap
mem=f76fb000 length=0000cca8 offset=c890d000
kallsyms_in_memory_addresses search failed
get function address from kallsyms
Disassembling kernel for specific functions
0 symbols are loaded.
0 symbols are loaded.
0 symbols are loaded.
0 symbols are loaded.