Unable to build solution

[NYP NB-IOT]

I got this error when building the solution. Rectify the problem as quickly as possible. Refer to the error circled in BLUE in the image below.

[awneil]

It's a lot easier if you copy & paste the text of the message - rather than a hard-to-read image.

You'll need to provide more detail on what, exactly, you've done to reach that point to enable anyone to help.