process chain scedule problem

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Hi, experts,

I have sub chain A, B, C, then made a main chain as

Start - A - B - C - aggregate

I got problem when I wanna to schedule main chain and run it. the main chain started but got error for run sub chain A, B, C

in SM37, I got log as following

BI_PROCESS_TRIGGER :

NO_MORE_SPACE: Can not create MTE: no more space: no more MESSAGE_CONTAINER slots available

BI_PROCESS_CHAIN :

Communication buffer deleted from previous run 40I9IQ7IE0LQYVAE7BMDTKPE7 (status X)

Version 'M' of chain ASPPC_COPA_PY_F was saved without checking

Version 'A' of chain ASPPC_COPA_PY_F was saved without checking

The Chain Was Removed From Scheduling

Program RSPROCESS successfully scheduled as job BI_PROCESS_DROPINDEX with ID 18354101

Program RSPROCESS successfully scheduled as job BI_PROCESS_INDEX with ID 18354101

I search the SDN and SAP Notes, i can not get answer of this problem.