feature #I69M1M 对上下文在脚本中的引用，支持自定义名称

liteflow-core/src/main/java/com/yomahub/liteflow/script/jsr223/JSR223ScriptExecutor.java

@@ -52,7 +52,7 @@ public abstract class JSR223ScriptExecutor implements ScriptExecutor {
             CompiledScript compiledScript = ((Compilable) scriptEngine).compile(convertScript(script));
             compiledScriptMap.put(nodeId, compiledScript);
         }catch (Exception e){
-            String errorMsg = StrUtil.format("script loading error for node[{}], error msg:{}", nodeId, e);
+            String errorMsg = StrUtil.format("script loading error for node[{}], error msg:{}", nodeId, e.getMessage());
             throw new ScriptLoadException(errorMsg);
         }