Solution : https://service.sap.com/sap/support/notes/1107027 (SAP Service marketplace login required)
Key words :
exception class cx_sy_message_in_plugin_modeprogram cl_alert_recipient============cpinclude cl_alert_recipient============cm010abap class cl_alert_recipientmethod read_nameline 24, bsp page terminated due, business server page, relevant support package, alert inbox, system displays, error message, errorwhat happened, error text, terms alrtinbox