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test error

Hello, when I run npm test, I got the following error - any idea on what's wrong?

D:\source\bibliuteket>npm test

[email protected] test D:\source\bibliuteket
jest

FAIL tests/App-test.js
× renders correctly (12ms)

● renders correctly

Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.

  at invariant (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:55:15)
  at createFiberFromTypeAndProps (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:2056:11)
  at createFiberFromElement (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:2077:15)
  at reconcileSingleElement (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:4629:23)
  at reconcileChildFibers (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:4686:35)
  at reconcileChildren (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:6508:28)
  at updateHostRoot (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:6920:5)
  at beginWork (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:7745:14)
  at performUnitOfWork (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:11413:12)
  at workLoop (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:11445:24)

console.error node_modules/react/cjs/react.development.js:188
Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: object.

Test Suites: 1 failed, 1 total
Tests: 1 failed, 1 total
Snapshots: 0 total
Time: 1.649s
Ran all test suites.
npm ERR! Test failed. See above for more details.

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