Importing a testplan via ExcelImporter Utility

I'm trying to import a testplan via the ExcelImporter Utility. Below is the config file.

testplan.XLSWorksheetID="Testplan"
testplan.XLSStartRow=2
testplan.dc:title=A
testplan.dc:description=B
testplan.priority=C
testplan.category term="Systems".value=D
testplan.category term="Release".value=E
testplan.category term="Test Plan Type".value=F
//testplan.Section("myns:com.ibm.rqm.planning.editor.section.planBusinessObjectives","RQM-KEY-TP-BUSS-OBJ-TITLE")=RichText(G)
//testplan.Section("myns:com.ibm.rqm.planning.editor.section.planTestObjectives","RQM-KEY-TP-TEST-OBJ-TITLE")=RichText(H)
//testplan.Section("myns:com.ibm.rqm.planning.editor.section.planTestEnvDetails","RQM-KEY-TP-TEST-ENV-DETAIL-TITLE")=RichText(I)
//testplan.Section("myns:com.ibm.rqm.process.web.entryCriteria","RQM-KEY-PROC-ENTRY-CRITERIA-TITLE")=RichText(J)
//testplan.Section("myns:com.ibm.rqm.process.web.exitCriteria","RQM-KEY-PROC-EXIT-CRITERIA-TITLE")=RichText(K)

//*Not sure why the Sections aren't importing. Some 403 Forbidden error.

Whenever I uncomment any of the testplan.Section lines, I get the following error: Has anyone run into this???