The MAPware-EBPro Modbus tag converter tool will not work if your application is in IEC Mode. This tool was designed for the Native Ladder (deprecated) programming mode that had pre-assigned Modbus addresses assigned each local address.
If your MAPware application uses IEC mode, you must create tags in the tag database and assign Modbus addresses to them. In order to import tags from MAPware into EBPro, export a tag .csv file from both MAPware and EBPro. Open both files to get an idea of the format that each uses, then copy the relevant information from the MAPware tag .csv file to the EBPro tag .csv file (such as tag name, data type, modbus address etc.)
Before exporting the tag file from EBPro, you may want to create some dummy tags in the Tag Address database in EBPro for relevant data types you will be importing. That way, you will be able to see how those tags are formatted and can copy over the tag information to match this format.
Once you have copied over the relevant information with the correct format, save the EBPro tag file and import it back into your EBPro project.