xtensa-lx106-elf-gcc: error while compiling this code.

I am using arduino IDE to code nodemcu / esp8266.

while compiling the code I am getting the following error,

xtensa-lx106-elf-gcc: error: libraries\DDUpdateUploadServer-master\DDUpdateUploadServer-master.a: No such file or directory

I have already downloaded all of the dependencies you have mentioned, I have tried few fixes but that does not seems to be working.

can you help me on this ?
Thanks