gives linker error in xcode 8.3.2

Hello,

1)I tries to download the project
2) unzip the project (not yet open in the xcode)
3)Open terminal
4) cd to my project path
5) $ sudo gem install cocoapods
6) $ pod install
I made sure the pod install properly.No error shown in the terminal
7)Open the project "**Microsoft Tasks.xcworkspace**" in xcode8.3.2
8)build the project
It gives me linker error

clang: error: linker command failed with exit code 1 (use -v to see invocation)

Please help me is there any step i am doing wrong ?