Not established connection in TypeORM - sql

Question

I've got a problem with running migrations in TypeORM. Right now when I launch yarn typeorm migration:run, he throw me this error:
CannotExecuteNotConnectedError: Cannot execute operation on "default" connection because connection is not yet established.
Can someone tell me what it mean?
Here is also my configuration:
ormconfig.ts
let connectionSource;
if (!process.env.PG_HOST) {
connectionSource = new DataSource({
type: "sqlite",
database: "sqlite_db",
entities: [join(__dirname, "./lib/db/entities/*.entity.{js,ts}")],
});
} else {
connectionSource = new DataSource({
type: "postgres",
host: process.env.PG_HOST,
port: +process.env.PG_PORT,
username: process.env.PG_USER,
database: process.env.PG_DB_NAME,
password: process.env.PG_PASS,
entities: [join(__dirname, "./lib/db/entities/*.entity.{js,ts}")],
migrations: [join(__dirname, "./lib/db/migrations/*.{js,ts}")],
migrationsTransactionMode: "each",
migrationsRun: true,
synchronize: true,
logging: false
});
}
export default connectionSource as DataSource;
script:
"typeorm": "ts-node ./node_modules/typeorm/cli.js -d ormconfig.ts",
I read that it can be a problem with initialize connection before running migrations, but how do this with using NestJS?
Thanks for any help!