Facing error graphql after installing SuiteCRM8

Hello Team,

I am installing suitecrm 8. I have installed successfully. But while opening webpage it show error in console. Below is the error.

https://a486e6606699.ngrok.io/SuiteCRM800/public/api/graphql 404 (Not Found)
506-es2015.87684172a7ad05f6600b.js:266 ERROR Error: undefined
at new t (477-es2015.78a85e6ecad91f13fce6.js:350)
at 477-es2015.78a85e6ecad91f13fce6.js:350
at 477-es2015.78a85e6ecad91f13fce6.js:350
at new P (polyfills-es2015.8c96a3d504d415ad14cc.js:48)
at Object.error (477-es2015.78a85e6ecad91f13fce6.js:350)
at g (477-es2015.78a85e6ecad91f13fce6.js:350)
at b (477-es2015.78a85e6ecad91f13fce6.js:350)
at e.value (477-es2015.78a85e6ecad91f13fce6.js:350)
at 477-es2015.78a85e6ecad91f13fce6.js:350
at Array.forEach ()

Please help me to find the solution.