Opening build/index.html and facing error

I am trying to run build/index.html of my react app which has cesium incorporated in it and it is showing me CORS error in it .
Error -
SecurityError: Failed to execute ‘texImage2D’ on ‘WebGL2RenderingContext’: The image element contains cross-origin data, and may not be loaded.

Error: Failed to execute ‘texImage2D’ on ‘WebGL2RenderingContext’: The image element contains cross-origin data, and may not be loaded.
at new pm (file:///C:/Users/Shivam%20Arora/reactlog/example/build/cesium/Cesium.js:3854:5297)
at He.update (file:///C:/Users/Shivam%20Arora/reactlog/example/build/cesium/Cesium.js:4581:1587)
at sD.update (file:///C:/Users/Shivam%20Arora/reactlog/example/build/cesium/Cesium.js:11747:173673)
at Rw.update (file:///C:/Users/Shivam%20Arora/reactlog/example/build/cesium/Cesium.js:11747:176923)
at ui.updateEnvironment (file:///C:/Users/Shivam%20Arora/reactlog/example/build/cesium/Cesium.js:14612:29471)
at S0t (file:///C:/Users/Shivam%20Arora/reactlog/example/build/cesium/Cesium.js:14612:38897)
at YT (file:///C:/Users/Shivam%20Arora/reactlog/example/build/cesium/Cesium.js:14612:39117)
at ui.render (file:///C:/Users/Shivam%20Arora/reactlog/example/build/cesium/Cesium.js:14612:40145)
at OT.render (file:///C:/Users/Shivam%20Arora/reactlog/example/build/cesium/Cesium.js:14614:1631)
at n (file:///C:/Users/Shivam%20Arora/reactlog/example/build/cesium/Cesium.js:14612:54821)