add error message as my flight starts to board

bids/modeling/statsmodels.py

@@ -288,6 +288,12 @@ def __init__(self, level, name, transformations=None, model=None,
                 group_by.append(self.level)
         self.group_by = group_by
 
+        # Check for intercept only run level model and throw an error
+        if (self.level == 'run') and (self.model['X'] == [1]):
+            raise NotImplementedError("Run level intercept only models are not currently supported."
+                                      "If this is a feature you need, please leave a comment at"
+                                      "https://github.com/bids-standard/pybids/issues/852.")
+
     def __repr__(self):
         return f"<{self.__class__.__name__}[{self.level}] {self.name}>"