What kind of the error is the U3057 ABEND?

Document ID : KB000123520
Last Modified Date : 22/12/2018
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When the client ran their existing program that accesses their IMS/DB and DB2, the U3075 ABEND was occurred. (It was executed with interpreter execution.)

What kind of the error is the U3057 ABEND? Why does the U3057 ABEND occur?
First of all, the explanation of the U3057 ABEND is shown in the IBM web site.
<https://www.ibm.com/support/knowledgecenter/ja/SSEPH2_13.1.0/com.ibm.ims13.doc.msgs/msgs/3057.htm> Japanese;
<https://www.ibm.com/support/knowledgecenter/en/SSEPH2_13.1.0/com.ibm.ims13.doc.msgs/msgs/3057.htm> English
Basically, it seems that the DB2 connection couldn't be established because the connection was failed..

First, please see the "Mixing IMS and DB2 Access" in the "IMS/DLI Interface Option Guide". (6-2)
If your CA-Easytrieve Plus program accesses an IMS database and DB2 for OS/390 or z/OS databases, you should run your program under the control of DB2-DL/I BATCH Support. Please see the "Mixing IMS and DB2 Access" for more info.
(Old cases said that this abend also occurs when an application program in a batch region makes an SQL call without specifying DB2, either using DDITV02 or SSM=member. )