When I upgrade from 2.0.8 to 2.2.1, I got this error :
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1278:20140110:163343.225 [Z3005] query failed: [1005] Can't create table 'zabbix.#sql-355_4' (errno: 150) [alter table application_template add constraint c_application_template_1 foreign key (applicationid) references applications (applicationid) on delete cascade]
1278:20140110:163343.225 database upgrade failed
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What can I do to solve it?