Add str to avoid np.str

lib/frontend/process_widgets/wxrr.py

@@ -469,7 +469,7 @@ def display_widgets_xrr_liquid(expt):
             "is_save=%s, "
             "is_print_info=%s"
             ")"%(
-                [elem for elem in list_xrr_files],
+                [str(elem) for elem in list_xrr_files],
                 'paths[\'dir_nxs\']',
                 expt.params['direct_scan_name'],
                 expt.params['roi_x0'],