import test cases with test scripts using RQM excel import tool

Hi, I'm trying to import a testcase with testscripts using "Testsuite with testcases that have testscripts" config file.

Am able to upload 1 or 2 testcases, scripts successfully but when I try to import multiple around 50 testcases , it is throwing some errors.

My cfg file look like this:

testscript.XLSStartRow=5

// use the data in the first row of a found script's column B
testscript.XLSArtifactID=B
testscript.dc:title=B
testscript.dc:description=G

// the literal "execution" will be put into the step type tag, so all steps will be of type execution
testscript.steps.type="execution"
testscript.steps.title=C
testscript.steps.name=C
testscript.steps.description=D
testscript.steps.expectedResult=E

testcase.category term="Priority".value=F
testcase.category term="TestType".value=H
testcase.category term="Project".value=J
testcase.category term="Test Phase".value=K
testcase.category term="Release".value=L

// a new script starts when we encounter an empty row
testscript.XLSDelimeter=\n

// we want to use the data we got for each test script to create a test case
testcase.ID=testscript.XLSArtifactID

// by refering to the testscript's field instead of the column that data comes from
// the tool will also create links to each of the test scripts.
testcase.dc:title=testscript.dc:title
testcase.dc:description=testscript.dc:description
testcase.alm:owner=I
testsuite.dc:title=B1
testsuite.dc:description=B2
testsuite.XLSLink=testcase

I am getting Internal error (500).  The log file  AppData\Roaming\Mso2Rqm is displaying below message:

sending testscript4 named Opt_in_winback_for_SME_user_registered_at_CTN_level__Negative_Testing
Server returned code OK
sending testscript5 named Login_to_My_account_and_Verify_winback_is_editable_for_SPT_user_registered_at_BAN_level
Server returned code OK
sending testscript6 named Login_to_My_account_and_Verify_winback_is_not_editable_for__SME_user_registered_at_CTN_level
Server returned code OK
sending testscript7 named Login_to_My_account_and_Verify_winback_is_editable_for__SME_user_registered_at_BAN_level
Server returned code OK
sending executionworkitem8 named Login_to_My_account_and_Verify_winback_is_editable_for__SME_user_registered_at_BAN_level
Server returned code InternalServerError
Error sending to server Login_to_My_account_and_Verify_winback_is_editable_for__SME_user_registered_at_BAN_level of type executionworkitem
Internal Server Error
sending executionworkitem9 named Login_to_My_account_and_Verify_winback_is_not_editable_for__SME_user_registered_at_CTN_level
Server returned code InternalServerError
Error sending to server Login_to_My_account_and_Verify_winback_is_not_editable_for__SME_user_registered_at_CTN_level of type executionworkitem
Internal Server Error
sending executionworkitem10 named Login_to_My_account_and_Verify_winback_is_editable_for_SPT_user_registered_at_BAN_level
Server returned code InternalServerError
Error sending to server Login_to_My_account_and_Verify_winback_is_editable_for_SPT_user_registered_at_BAN_level of type executionworkitem
Internal Server Error
sending executionworkitem11 named Login_to_My_account_and_Verify_winback_is_not_editable_for__SPT_user_registered_at_CTN_level
Server returned code InternalServerError


I have posted part of log message.  Is the way I specified the test case, test script is wrong? why it has worked for few TCs but not working for others.  Would anybody please help me on this.  Thanks in Advance.