id,summary,reporter,owner,description,type,status,priority,milestone,component,resolution,keywords,cc,workpackage 628,Error when using core_multi_shell model,lewis,,"When attempting to fit data using the core_multi_shell model, the following error message occurs (for n=1): {{{ Error(s) Occurred: Traceback (most recent call last): File ""/vagrant/sasview/src/sas/sasgui/perspectives/fitting/fit_thread.py"", line 82, in compute result = map(map_apply, inputs) File ""/vagrant/sasview/src/sas/sasgui/perspectives/fitting/fit_thread.py"", line 14, in map_apply return apply(arguments[0], arguments[1:]) File ""/vagrant/sasview/src/sas/sasgui/perspectives/fitting/fit_thread.py"", line 11, in map_getattr return getattr(classInstance, classFunc)(*args) File ""/vagrant/sasview/src/sas/sascalc/fit/BumpsFitting.py"", line 261, in fit if M.get_to_fit()] File ""/vagrant/sasview/src/sas/sascalc/fit/BumpsFitting.py"", line 123, in __init__ self._define_pars() File ""/vagrant/sasview/src/sas/sascalc/fit/BumpsFitting.py"", line 139, in _define_pars value = self.model.getParam(k) File ""/vagrant/sasmodels/sasmodels/sasview_model.py"", line 438, in getParam raise ValueError(""Model does not contain parameter %s"" % name) ValueError: Model does not contain parameter thickness2.npts None Further information might be available in the Console log (bottom right corner). }}} I've noticed the error only occurs if you don't click the ""Compute"" button before clicking ""Fit"". The error occurs for all values of n, apart from n=0, and always seems to be ""Model does not contain parameter thickness(n+1).npts"" ",defect,closed,minor,,SasView,fixed,,,SasView Bug Fixing