ERROR 1067 (42000): Invalid default value for 'created_at'

Question

When I tried to alter the table it showed the error:

ERROR 1067 (42000): Invalid default value for \'created_at\'

I googled for this error

Answer 1

I came across the same error while trying to install a third party database. I tried the solution proposed unsuccessfully i.e.
SET sql_mode = '';

Then I tried the command below which worked allowing the database to be installed
SET GLOBAL sql_mode = '';