New Installation PlatformIO Windows x64 Compile Error (Everything Installed Properly)

I am new to this Community & Platform.

I have a Code which i need to write for my NRF24l01 Arduino Pro Mini 8Mhz & 1" OLED.

When i Imported the project from Arduino 1.6.5 to PlatformIO IDE 1.7.1 Core 3.2.1

It showed me Some Warnings & No Error Without:

collect2.exe: error: ld returned 1 exit status
*** [.pioenvs\pro8MHzatmega328\firmware.elf] Error 1

I cannot Build it, There is no Error Shown Unless the written one.


You need to add to lib_deps Button library.