STEP7: Event ID 16# 4575

HI, the problem is with PLC error, aftet part of time working the PLC stops with message (diagnostic buffer) :
Event 1 of 100: Event ID 16# 4575
STOP caused by exceeding block stack nesting depth in the priority class stack Caused by OB: 0 Priority class: 0 Previous operating mode: Configuration in RUN Requested operating mode: STOP (update) Internal error, Incoming event 10:21:56:480 am 04/10/06
STEP's hint: reduce the number of nested block calls The program is simply and has only one call function. where could be the problem ?
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