Fix balance arg (#1404)

mythril/laser/ethereum/instructions.py

@@ -905,7 +905,7 @@ class Instruction:
         address = state.stack.pop()
         if address.symbolic is False:
             balance = global_state.world_state.accounts_exist_or_load(
-                address, self.dynamic_loader
+                address.value, self.dynamic_loader
             ).balance()
         else:
             balance = symbol_factory.BitVecVal(0, 256)

mythril/support/loader.py

@@ -64,7 +64,7 @@ class DynLoader:
         if not self.active:
             raise ValueError("Loader is disabled")
         if not self.eth:
-            raise ValueError("Cannot load from the storage when eth is None")
+            raise ValueError("Cannot load from the chain when eth is None")
 
         log.debug("Dynld at contract %s", dependency_address)