Import RxJS模块更新后出现错误。如何解决？

在我的angular 5项目中。我的导入一直在产生奇怪的错误，我不记得几天前有过这些错误。对于下面的导入，它说：“模块…rxjs/observable没有导出的成员observable”

我以前没有这个

有趣的是，这个有角度的网站，包括可观察的功能，工作得很好

这是我的package.json：

"private": true,
  "dependencies": {
    "@angular-devkit/core": "0.0.29",
    "@angular/animations": "^5.2.0",
    "@angular/cdk": "^5.2.5",
    "@angular/common": "^5.2.0",
    "@angular/compiler": "^5.2.0",
    "@angular/core": "^5.2.0",
    "@angular/forms": "^5.2.0",
    "@angular/material": "^5.2.0",
    "@angular/material-moment-adapter": "^5.2.5",
    "@angular/platform-browser": "^5.2.0",
    "@angular/platform-browser-dynamic": "^5.2.0",
    "@angular/router": "^5.2.0",
    "bootstrap": "^4.0.0",
    "core-js": "^2.4.1",
    "jsonwebtoken": "^8.2.0",
    "moment": "^2.20.1",
    "moment-duration-format": "^2.2.2",
    "npm": "^5.6.0",
    "rxjs": "^5.5.12",
    "zone.js": "^0.8.19"
  },

---

不幸的是，我不知道如何解决进口问题。然而，我认为可能值得一提的是，我在升级到Angular 6的最新版本时遇到了类似的问题，也就是说rxjs 6.3.0。因此，我降级到6.2.1，这使得导入错误消失了

"private": true,
  "dependencies": {
    "@angular-devkit/core": "0.0.29",
    "@angular/animations": "^5.2.0",
    "@angular/cdk": "^5.2.5",
    "@angular/common": "^5.2.0",
    "@angular/compiler": "^5.2.0",
    "@angular/core": "^5.2.0",
    "@angular/forms": "^5.2.0",
    "@angular/material": "^5.2.0",
    "@angular/material-moment-adapter": "^5.2.5",
    "@angular/platform-browser": "^5.2.0",
    "@angular/platform-browser-dynamic": "^5.2.0",
    "@angular/router": "^5.2.0",
    "bootstrap": "^4.0.0",
    "core-js": "^2.4.1",
    "jsonwebtoken": "^8.2.0",
    "moment": "^2.20.1",
    "moment-duration-format": "^2.2.2",
    "npm": "^5.6.0",
    "rxjs": "^5.5.12",
    "zone.js": "^0.8.19"
  },