diff --git a/src/main/java/org/lemsml/jlems/core/type/dynamics/Dynamics.java b/src/main/java/org/lemsml/jlems/core/type/dynamics/Dynamics.java
index 61fb70f..a44b5fa 100644
--- a/src/main/java/org/lemsml/jlems/core/type/dynamics/Dynamics.java
+++ b/src/main/java/org/lemsml/jlems/core/type/dynamics/Dynamics.java
@@ -20,6 +20,7 @@
 import org.lemsml.jlems.core.run.EventAction;
 import org.lemsml.jlems.core.run.KScheme;
 import org.lemsml.jlems.core.run.StateType;
+import org.lemsml.jlems.core.run.RuntimeError;
 import org.lemsml.jlems.core.sim.ContentError;
 import org.lemsml.jlems.core.type.Component;
 import org.lemsml.jlems.core.type.ComponentType;
@@ -525,7 +526,7 @@ public Valued getValued(String select) throws ContentError {
 
 
 
-	public void checkEquations(HashMap<String, Dimensional> cdimHM) throws ContentError {
+	public void checkEquations(HashMap<String, Dimensional> cdimHM) throws ContentError, RuntimeError {
         
 		HashMap<String, Dimensional> dimHM = new HashMap<String, Dimensional>();
 
@@ -559,7 +560,8 @@ public void checkEquations(HashMap<String, Dimensional> cdimHM) throws ContentEr
 			try {
 				dimHM.put(dv.getName(), dv.getDimensionality(dimHM));
 			} catch (ContentError ce) {
-				E.error("Checking " + dv + " in " + r_type + " " + ce.getMessage());
+				throw new RuntimeError("Checking " + dv + " in " + r_type + " " + ce.getMessage());
+
 			}
 		}
 
@@ -567,7 +569,7 @@ public void checkEquations(HashMap<String, Dimensional> cdimHM) throws ContentEr
 			try {
 				dimHM.put(cdv.getName(), cdv.getDimensionality(dimHM));
 			} catch (ContentError ce) {
-				E.error("Checking " + cdv + " in " + r_type + " " + ce.getMessage());
+				throw new RuntimeError("Checking " + cdv + " in " + r_type + " " + ce.getMessage());
 			}
 		}