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PROII error message, please help diagnose it.

2019-07-19View Original

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A process simulation model was created using PROII, but as soon as the \"Run\" button was pressed, the following message appeared. Could an expert take a look and tell me what problems this kind of message might indicate? Thank you! I checked the output report; it only shows loop 1 and loop 2, but no loop 3. 1 error(s), 0 warning(s), and 0 message(s) detected: *** error *** The starting unit operation was sequenced after the ending unit operation for recycle loop 3. The starting or ending unit is missing for recycle loop 3.

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