Oracle: EXP-00091 Exporting questionable statistics tips

We can remove the this kind of error like EXP-00091  using  statistics=none or by setting the client character set 

Below is an example 

exp userid= Schema_name/schema_password@db_service_name full=N  statistics=none owner=(Schema_name1, Schema_name2) file=/DATABASE/u01/DB_Schema.dmp log=/DATABASE/u01/ DB_Schema.log