Convert to parquet failed. The following chunks could not be processed:

Hello, Celonis community and team,

this is our first C4C project. We have provided the client with a Celonis ABAP-Skript and used the SAP ABAP Output Uploader. In the third stage “Processing”, some of the 86 SAP tables could not be processed. The following issues arise for the respective tables:

EINA:
Convert to parquet failed. The following chunks could not be processed: EINA_1_20201203_155035.csv, EINA_1_20201203_154720.csv, EINA_0_20201203_155035.csv, EINA_0_20201203_154720.csv

EINE:
Convert to parquet failed. The following chunks could not be processed: EINE_1_20201203_155048.csv, EINE_0_20201203_154734.csv, EINE_0_20201203_155048.csv

MARC:
Convert to parquet failed. The following chunk could not be processed: MARC_2_20201204_080156.csv

MSEG:
Convert to parquet failed. The following chunk could not be processed: MSEG_93_20201204_102543.csv

T023UT:
Job failed

T16FE:
Job failed

What could be the reasons for these issues? The tables incurring the error “Convert to parquet failed. The following…” seem to be no different from the correctly processed ones.