Can't find record in 'tablename' on select in MqSql

i am getting Can't find record in 'tablename' error. I am using MySql.
What is cause for this error?
As I know if we insert and delete from a table while selecting from the same table, We can get this error.
but what is my doubt is we also get 'lock wait time out exception'.

Can any one clarify this.

In advance thanks.

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