Previous job was not completed correctly

What causes this issue?

When you determine the start date of a job, you can also specify a
preceeding job that will be started when this job ends. The start date
can be dependent on the scheduling status of its predecessor - that is,
the job is only started when its predecessor is scheduled correctly, or
is started regardless of the scheduling status of the predecessor job.
This messages means that this job is only be started when the
predecessor job runs properly. The predecessor job did not run
error-free, however, and this job could not be started as a result.

System Response

The job whose predecessor job ended with an error is no longer started
or executed. Instead, it is set to status "Cancelled", and this
message is written to the job log.
If this job itself has successor jobs, these are started afterwards.
The system acts as if a job was terminated due to error.

How to fix this error?

There are several ways to react to this error message:
The present status-specific predecessor/successor relationship may not
be entirely necessary in this case. If this is the case, the
job can be started regardless of the status of its predecessor.
If the predecessor/successor relationship cannot be changed, you must
analyze and correct the reason for the termination for the successor
job to run properly in future. Refer to the job log of the predecessor
job and, possibly, the general SAP system log.

Error message extract from SAP system. Copyright SAP SE.