SECURITY ERROR: This download does NOT match an earlier download recorded in go.sum

[gavmckee80]

I'm getting the following error when pulling the repo. Can someone advise ?

`
GOROOT=/usr/local/Cellar/go/1.13.4/libexec #gosetup
GOPATH=/Users/gav/go #gosetup
/usr/local/Cellar/go/1.13.4/libexec/bin/go mod tidy #gosetup
go: downloading google.golang.org/grpc v1.27.1
go: downloading gopkg.in/yaml.v2 v2.2.8
go: downloading golang.org/x/net v0.0.0-20200222125558-5a598a2470a0
go: downloading github.com/prometheus/client_golang v1.4.1
go: downloading github.com/golang/protobuf v1.3.3
go: downloading github.com/influxdata/influxdb1-client v0.0.0-20191209144304-8bf82d3c094d
go: downloading github.com/xtaci/kcp-go v5.4.20+incompatible
go: extracting github.com/influxdata/influxdb1-client v0.0.0-20191209144304-8bf82d3c094d
go: extracting github.com/prometheus/client_golang v1.4.1
go: downloading github.com/stretchr/testify v1.4.0
go: downloading gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15
go: downloading github.com/aristanetworks/glog v0.0.0-20191112221043-67e8567f59f3
go: extracting github.com/xtaci/kcp-go v5.4.20+incompatible
go: extracting github.com/golang/protobuf v1.3.3
go: downloading golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d
go: extracting github.com/aristanetworks/glog v0.0.0-20191112221043-67e8567f59f3
go: downloading github.com/prometheus/procfs v0.0.10
go: extracting github.com/stretchr/testify v1.4.0
go: extracting github.com/prometheus/procfs v0.0.10
go: downloading golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
go: extracting gopkg.in/yaml.v2 v2.2.8
go: extracting golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
go: extracting google.golang.org/grpc v1.27.1
go: extracting gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15
go: downloading github.com/kr/pretty v0.2.0
go: extracting golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d
go: downloading github.com/klauspost/reedsolomon v1.9.3
go: downloading github.com/prometheus/common v0.9.1
go: downloading github.com/pkg/errors v0.9.1
go: extracting github.com/kr/pretty v0.2.0
go: downloading github.com/Shopify/sarama v1.26.1
go: extracting golang.org/x/net v0.0.0-20200222125558-5a598a2470a0
go: extracting github.com/pkg/errors v0.9.1
go: extracting github.com/prometheus/common v0.9.1
go: downloading github.com/tjfoc/gmsm v1.3.0
go: downloading golang.org/x/sys v0.0.0-20200219091948-cb0a6d8edb6c
go: downloading github.com/cespare/xxhash/v2 v2.1.1
go: downloading github.com/kr/text v0.1.0
go: extracting github.com/klauspost/reedsolomon v1.9.3
go: downloading github.com/prometheus/client_model v0.2.0
go: extracting github.com/cespare/xxhash/v2 v2.1.1
go: extracting github.com/Shopify/sarama v1.26.1
go: extracting github.com/kr/text v0.1.0
go: downloading golang.org/x/tools v0.0.0-20200221224223-e1da425f72fd
go: downloading github.com/klauspost/cpuid v1.2.3
verifying github.com/tjfoc/gmsm@v1.3.0: checksum mismatch
downloaded: h1:qhgkrZru95jFP9NbVPknJvc9vgkMXhOEzkOASKdc0oQ=
go.sum: h1:i7c6Za/IlgBvnGxYpfD7L3TGuaS+v6oGcgq+J9/ecEA=

SECURITY ERROR
This download does NOT match an earlier download recorded in go.sum.
The bits may have been replaced on the origin server, or an attacker may
have intercepted the download attempt.

For more information, see 'go help module-auth'.
`