get error message while generating coverage report

when I try to generate coverage report, I get the following error message in 'command window', the Matlab version I'm using is 2007a+

??? Undefined function or variable 'check_matlab_version'.

??? Undefined function or variable 'check_matlab_version'.

Error in ==> simcoverage\private\report_create_structured_data>fix_sf_based_block_hierarchy at 339 cfChartIsa = sf('get','default','chart.isa');

Error in ==> simcoverage\private\report_create_structured_data at 311 [removeSystems,cvstruct] = fix_sf_based_block_hierarchy(removeSystems,cvstruct);

Error in ==> C:\MATLAB\R2007a\toolbox\slvnv\simcoverage\cvhtml.p>cvhtml at 363 [cvstruct,sysCvIds] = report_create_structured_data(allTests, testIds, metricNames,waitbarH,1);

Error in ==> simcoverage\private\generate_results at 152 cvhtml(fileName, testObj, reportOptions);

Error in ==> simcoverage\private\cv_term_dialog_test at 9 generate_results('term', testId);

??? Undefined function or variable 'check_matlab_version'.