About how to add an example

Hello, I am trying to receive a QZSS disaster report using the SPRESENSE board.
First, to make sure that you are receiving GNSS,
You are about to add an example of GNSS.

I have already built the SPRESENSE SDK and confirmed that hello world can be done, but
Add GNSS example configuration and
When I try to build it, I see the following:

/bin/sh:1:kconfig-conf:not found
make[1]:***[do_olddefconfig] Error 127
make:*** [olddefconfigkernel] error 2
Post process failed.512
Try 'make disticleankernel' first.

I did make disticleankernel and make clean in the sdk directory, but
There was no change.
I'm a beginner, so there may be some basic oversight, but
I look forward to hearing from you.