Error message:protoc-gen-go: Plugin failed with status code 1 - go

Question

This is not a duplicate question
First, I made sure I have the following configuration:
1 export GOPATH=/Users/chezixin/go
2 export GOBIN=/Users/chezixin/go/bin
3
4 export GO111MODULE=on
5 # 123
6 export GOPROXY=https://goproxy.cn
7
8
9 export PATH="$PATH:/Applications/Postgres.app/Contents/Versions/12/bin:/Users/chezixin/flutterSDK/flutter/bin:/usr/local/go/bin:$GOPATH:$GOBIN"
10
czxmac:~ chezixin$ echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/sbin:
/sbin:/Applications/VMwareFusion.app/Contents/Public:
/Applications/Postgres.app/Contents/Versions/latest/bin:
/Applications/Postgres.app/Contents/Versions/12/bin:
/Users/chezixin/flutterSDK/flutter/bin:/usr/local/go/bin:
/Users/chezixin/go:/Users/chezixin/go/bin':
/Users/chezixin/Go/bin:/Applications/Postgres.app/Contents/Versions/12/bin:
/Users/chezixin/flutterSDK/flutter/bin:
/usr/local/go/bin:/Users/chezixin/go:
/Users/chezixin/go/bin:/Users/chezixin/Go/bin
Already installed:
go get -u google.golang.org/grpc
look protoc：
czxmac:~ chezixin$ protoc --version
libprotoc 3.11.1
Protoc-gen-go is installed and exists in $ GOPATH/bin
go get -u github.com/golang/protobuf/protoc-gen-go
problem:
When I execute the following command
$ protoc --go_out=plugins=grpc:. *.proto
An error occurred:
protoc-gen-go: program not found or is not executable
Please specify a program using absolute path or make sure the program is available in your PATH system variable
--go_out: protoc-gen-go: Plugin failed with status code 1.
Where is the problem, please master guidance.

Answer 1

This issue is related with your PATH variable, please set it again.
I can see a typo of an extra trailing apostrophe(') in this line of PATH variable. /Users/chezixin/go:/Users/chezixin/go/bin':
Try updating it to
/Users/chezixin/go:/Users/chezixin/go/bin:

Answer 2

For anyone facing a similar issue, but it was not the case of an invalid PATH variable, I very much sympathize with you.
I realized that I had to install the compiler (again?) before it started working. I hadn't installed it before, but it appeared to already be downloaded. I guess I had to install it again or update it.
I personally was using betterproto, and I followed the instructions here to install it with the protoc plugin and try out their example.