Hello Bhala,
Unfortunately, DSpace requires very specific input formats, and cannot simply import any file that you export from EPrints. Unfortunately, that "dc.txt" file is not a format that DSpace will understand.
It looks like you are using the DSpace "Batch Import" option (from the JSPUI), and selecting that the format is "CSV" (comma-separated values). However, that "dc.txt" format is not a valid CSV file. CSV files are spreadsheets of metadata, and DSpace expects to import a CSV that has columns which correspond to valid metadata fields in DSpace. So, if you wish to simply import metadata, you'd have to transform that "dc.txt" file into a valid CSV that DSpace will understand.
Keep in mind though that, when importing a CSV, you can *only* import metadata -- no files will be imported alongside that metadata.
I'll admit, I don't know which option is better for you, as it's unclear if you are migrating metadata-only content, or if you have metadata + files that you wish to upload into DSpace. If you provide more information about what you are trying to migrate, others on this mailing list might have more specific advice on how to either create a proper CSV (for metadata-only import) or create a Simple Archive Format package (for metadata + files import).
Finally, if you want someone to simply do the migration for you, you also could consider contacting one of our DSpace Service Providers. Our Service Providers are experts in migrating content into DSpace, and you could contact them for a quote for doing this work on your behalf. Here's the service providers list:
https://duraspace.org/dspace/resources/service-providers/
Sincerely,
Tim