Unable to open potm file after redaction

GroupDocs.Redaction Product Family
21

Hi I tried the SDK version mentioned above and the issue is fixed but while doing redaction for XML files getting below error

Caused by: java.lang.IllegalArgumentException: Cannot convert this load format to a save format.
	at com.groupdocs.redaction.internal.c.a.w.FileFormatUtil.loadFormatToSaveFormat(Unknown Source)
	at com.groupdocs.redaction.integration.V.save(Unknown Source)
	at com.groupdocs.redaction.e.save(Unknown Source)
	at com.groupdocs.redaction.Redactor.save(Unknown Source)
	at