An unhandled exception occurred: The development server only supports localizing a single...

Please advise how this error can be fixed, I'm trying to implement localization but having this issue. Guide I used: https://angular.io/guide/i18n#merge-translations-into-the-app If it will help, I was able to run using ng serve --configuration=ru --open and app was localized, but after I used _build.bat it broke my app and I cannot run it anymore at all. If I specify different port it throws an error "NGCC failed". Here's example of my code from angular.json file:

"projects": {
"operator": {
"i18n": {
"sourceLocale": "en-US",
"locales": {
"ru": "src/locale/messages.ru.xlf"
}
},
"projectType": "application",
"schematics": {},
"root": "",
"sourceRoot": "src",
"prefix": "app",
"architect": {
"build": {
"builder": "@angular-devkit/build-angular:browser",
"options": {
"outputPath": "dist/operator",
"index": "src/index.html",
"main": "src/main.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "tsconfig.app.json",
"aot": true,
"localize": true,
"assets": [
"src/favicon.ico",
"src/assets"
],
"styles": [
"src/styles.css"
],
"scripts": ["src/version.js"]
},
"configurations": {
"ru": {
"localize": ["ru"]
},
"production": {
"fileReplacements": [
{
"replace": "src/environments/environment.ts",
"with": "src/environments/environment.prod.ts"
}
],
"optimization": true,
"outputHashing": "all",
"sourceMap": false,
"extractCss": true,
"namedChunks": false,
"extractLicenses": true,
"vendorChunk": false,
"buildOptimizer": true,
"budgets": [
{
"type": "initial",
"maximumWarning": "3mb",
"maximumError": "5mb"
},
{
"type": "anyComponentStyle",
"maximumWarning": "6kb",
"maximumError": "10kb"
}
]
}
}
},
"serve": {
"builder": "@angular-devkit/build-angular:dev-server",
"options": {
"browserTarget": "operator:build"
},
"configurations": {
"production": {
"browserTarget": "operator:buildroduction"
},
"ru": {
"browserTarget": "operator:build:ru"
}
}
}

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