Mos build keep failing for esp32

I was trying to build a firmware but it keep failing
here is the log :
onnecting to https://mongoose.cloud, user test
Uploading sources (2668 bytes)
Handling lib “ca-bundle”…
ca-bundle: Prepared local dir: “/data/fwbuild-volumes/latest/apps/new/esp8266/build_contexts/build_ctx_166057694/ca-bundle”
Error: open /data/fwbuild-volumes/latest/apps/new/esp8266/build_contexts/build_ctx_166057694/ca-bundle/mos.yml: no such file or directory
/go/src/github.com/mongoose-os/mos/mos/manifest_parser/manifest_parser.go:890: reading manifest “/data/fwbuild-volumes/latest/apps/new/esp8266/build_contexts/build_ctx_166057694/ca-bundle/mos.yml”
/go/src/github.com/mongoose-os/mos/mos/manifest_parser/manifest_parser.go:797:
/go/src/github.com/mongoose-os/mos/mos/manifest_parser/manifest_parser.go:579:
/go/src/github.com/mongoose-os/mos/mos/manifest_parser/manifest_parser.go:748:
/go/src/github.com/mongoose-os/mos/mos/manifest_parser/manifest_parser.go:662:
/go/src/github.com/mongoose-os/mos/mos/manifest_parser/manifest_parser.go:461:
/go/src/github.com/mongoose-os/mos/mos/manifest_parser/manifest_parser.go:147:
/go/src/github.com/mongoose-os/mos/mos/build_local.go:144:
/go/src/github.com/mongoose-os/mos/mos/build.go:223:
/go/src/github.com/mongoose-os/mos/mos/build.go:166:
/go/src/github.com/mongoose-os/mos/mos/main.go:194: build failed
Handling lib “aws”…
Handling lib “ota-shadow”…
Handling lib “ota-http-client”…
Handling lib “ota-common”…
Handling lib “sntp”…
Handling lib “rpc-service-fs”…
Handling lib “mjs”…
Handling lib “rpc-uart”…
Handling lib “rpc-service-config”…
Handling lib “mq135”…
Handling lib “wifi”…
Handling lib “dht”…
Handling lib “mqtt”…
Handling lib “core”…
Handling lib “bt-service-config”…
Error: /build/mos-latest-PP_bu7/mos-latest-201905091421+aeff6af~bionic0/go/src/github.com/mongoose-os/mos/mos/build_remote.go:326: build failed
/build/mos-latest-PP_bu7/mos-latest-201905091421+aeff6af~bionic0/go/src/github.com/mongoose-os/mos/mos/build.go:223:
/build/mos-latest-PP_bu7/mos-latest-201905091421+aeff6af~bionic0/go/src/github.com/mongoose-os/mos/mos/build.go:166:
/build/mos-latest-PP_bu7/mos-latest-201905091421+aeff6af~bionic0/go/src/github.com/mongoose-os/mos/mos/main.go:194: build failed
exit status 1
Command completed.

please help me with this

There should be a full log in the build/ directory, which should have a line that pinpoints the issue.