ABAP/4 processor: UNCAUGHT_EXCEPTION when running a process chain

After select the log view for a process chain, a msg box pops up that says:

Status Change of Process “Variant_Name”

Save Status and Trigger Events if Appropriate

With Yes and No button.

Which button should I click? No matter which button I click, the log view shows that the variant showed with the above “Variant_Name” is red color error. And the running of the process chain stops here at this variant. This variant is just for deleting indexes of two cubes before loading data to the two cubes. If I right click this error variant and select Displaying Messages, find there are four lines listed as below:

1. Job started

2. Step 001 started (program RSPROCESS, variant &0000000004565, user ID ALEREMOTE)

3. ABAP/4 processor: UNCAUGHT_EXCEPTION

4. Job cancelled

How to resolve the red error and make the process chain continue to run?

Thanks a lot!