panic: unknown export format version -1

[fhmily]

go version:
go version devel +30b6bc30b2 Thu May 24 22:08:00 2018 +0000 darwin/amd64

Using GoCode with VIM & YCM. Panic even with fmt. with the following logs.

panic: unknown export format version -1 ("i\x00\xe9\x03\xc6\x06\x18$GOROOT/src/fmt/print.go\x00\x05Write\x01b\x01n\x03err\x05Width\x03wid\x02ok\tPrecision\x04prec\x04Flag\x01c\x06Format\x01f\x05State\x06String\bGoString\x01w\x06Writer\x02io\x06format\x01a\aesc:0x1\aesc:0x9\x17$GOROOT/src/fmt/scan.go\bReadRune\x01r\x04size")
1(runtime.call32): /usr/local/Cellar/go/HEAD-30b6bc3/libexec/src/runtime/asm_amd64.s:554
2(runtime.gopanic): /usr/local/Cellar/go/HEAD-30b6bc3/libexec/src/runtime/panic.go:494
3(main.(*gc_bin_parser).parse_export): /Users/jackwang/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/gocode/package_bin.go:126
4(main.(*package_file_cache).process_package_data): /Users/jackwang/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/gocode/package.go:129
5(main.(*package_file_cache).update_cache): /Users/jackwang/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/gocode/package.go:90
6(main.update_packages.func1): /Users/jackwang/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/gocode/autocompletecontext.go:412
7(runtime.goexit): /usr/local/Cellar/go/HEAD-30b6bc3/libexec/src/runtime/asm_amd64.s:1365

panic: One of the package cache updaters panicked
1(runtime.call32): /usr/local/Cellar/go/HEAD-30b6bc3/libexec/src/runtime/asm_amd64.s:554
2(runtime.gopanic): /usr/local/Cellar/go/HEAD-30b6bc3/libexec/src/runtime/panic.go:494
3(main.update_packages): /Users/jackwang/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/gocode/autocompletecontext.go:420
4(main.(*auto_complete_context).update_caches): /Users/jackwang/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/gocode/autocompletecontext.go:165
5(main.(*auto_complete_context).apropos): /Users/jackwang/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/gocode/autocompletecontext.go:334
6(main.server_auto_complete): /Users/jackwang/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/gocode/server.go:202
7(main.(*RPC).RPC_auto_complete): /Users/jackwang/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/gocode/rpc.go:26
8(runtime.call64): /usr/local/Cellar/go/HEAD-30b6bc3/libexec/src/runtime/asm_amd64.s:555
9(reflect.Value.call): /usr/local/Cellar/go/HEAD-30b6bc3/libexec/src/reflect/value.go:447
10(reflect.Value.Call): /usr/local/Cellar/go/HEAD-30b6bc3/libexec/src/reflect/value.go:308
11(net/rpc.(*service).call): /usr/local/Cellar/go/HEAD-30b6bc3/libexec/src/net/rpc/server.go:384
12(runtime.goexit): /usr/local/Cellar/go/HEAD-30b6bc3/libexec/src/runtime/asm_amd64.s:1365

I've already tried upgrading both system $gopath gocode and the one under YCM third_party directory.

gocode repo version under both path:
commit 9d1e0378d35b0527c9aef0d17c0913fc38d88b81 (HEAD, origin/master, origin/HEAD, master)

[fhmily]

It seems everything goes well after I switch to repo: https://github.com/mdempsky/gocode