Solving error "MySQL server has gone away"

If you have time, you can read the article "MySQL server has gone away". OR just do 3 steps as the following:
1. Find my.ini file if you are using Windows (it can locate in C:\ProgramData\MySQL\MySQL Server 5.5\). OR my.cnf file if you are using Linux (it can locate in /etc/mysql/my.cnf)

2. Increase max_allowed_packet value below [mysqld] section (by default max_allowed_packet =1M or not defined), for example you change it to 32M:
[mysqld]
max_allowed_packet=32M

3. Restart mysql service