我正在部署我的Angular应用程序，但遇到以下错误：

sh: 1: ./heroku.build.sh: Permission denied
npm ERR! code ELIFECYCLE
npm ERR! errno 126
npm ERR! [email protected] heroku-postbuild: `./heroku.build.sh

字符串
package.json

"heroku-postbuild": "./heroku.build.sh"

型
heroku.build.sh

#!/usr/bin/env bash

usage() {
  echo "OVERVIEW: Build apps according to BUILD_ENV value. Meant to be used for Heroku deployment"
  exit
}

if [ "$1" = '-h' ] || [ "$1" = '--help' ]; then
  usage
fi

(
  if [ "$BUILD_ENV" ]; then
    ng build $BUILD_ENV --configuration $ENVIRONMENT && ng run $BUILD_ENV:server:$ENVIRONMENT
  else
    echo "Error: no build config for BUILD_ENV value '$BUILD_ENV'"
    exit 1
  fi
)

型
如何修复此错误？
我删除了node_modules，并删除了heroku.build.sh，但它仍然不工作。