Common Errors In Apex Salesforce |

In this video we have covered a few general errors from Apex as below:
Attempt to de-reference a null object
DML currently not allowed
List has no rows for assignment to SObject
List has more than 1 row for assignment to SObject
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[@habeebshaik2718]

Thank you So much.This is very useful.
Please errors in visualforce,lighning.

[@khushigoyal9840]

Hey when i'm going for create a new lightning page i am not able to click on app page ..in the left corner of the screen it is showing javascript(0)