If you are Searching for Facebook Error Login Issue then don’t worry you just have to Check out this blog. So that you will get to know that How you can Fix & Solve this Error.
Login Error: There is an error in logging you onto this application. please try again later. how to solve this facebook login error ?
this is a common error when use the facebook. in this blog i will guide you how to solve this error. Below is a step-by-step guide on how you can solve facebook login error.
Fix Facebook Error Login :

step 1 : Open the phone/mobile settings. To find out the apps option.

step 2 : After finding out the apps now open the apps option. To find out the Facebook application.

step 3 : Now find the Facebook app and open it.

step 4 : Open the facebook app and click on the force stop and click Ok.

step 5 : Now click on the storage and click on the clear cache button.

step 6 : Open the permissions and enable all the permissions.

step 7 : Open the default option and clear all the defaults.

step 8 : Click on the modify system settings and don’t allow it.

step 9 : Open draw over the apps and select yes.

If the app is still not working then restart your mobile/phone. now open the facebook app. I hope now you will see the app is completely working fine. so please try these steps and i hope your problem will be solved.