release-please not able to find nested package.json

package.json is present inside ui folder

`ui/
package.json
release-please-config.json
.release-please-manifest.json`

release-please-config.json file looks like

{
"packages":
"ui": {
"package-name: "ui",
"release-type: "node",
"path:"ui"
}

}

I have github workflow to trigger release-please. When release-please runs, I get the error package.json is missing.