It looks like you've somehow managed to get into a situation where you have a recording schedule for a channel that no longer exists.
Have you deleted some channels recently?
C:\Program Files\MySQL\MySQL Server 5.6\bin>mysql.exe -h localhost -u root -p
Enter password: ***********
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 12
Server version: 5.6.10 MySQL Community Server (GPL)
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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use MpTvDb
Database changed
mysql> DELETE FROM Schedule WHERE NOT EXISTS (SELECT * FROM Channel WHERE Channel.idChannel = Schedule.idChannel);
Query OK, 1 row affected (0.00 sec)
mysql> DELETE FROM Schedule WHERE NOT EXISTS (SELECT * FROM Channel WHERE Channel.idChannel = Schedule.idChannel);
Query OK, 0 rows affected (0.00 sec)
mysql> commit
-> ;
Query OK, 0 rows affected (0.00 sec)
mysql> \q
Bye