我有一个百里香叶表达式th:value="${Drop down with spl Chars}“,它在求值过程中出现以下错误ognl.ExpressionSyntaxException:格式错误的OGNL表达式: Drop with spl Chars at org.thymeleaf.standard.expression.OGNLVariableExpressionEvaluator.evaluate(OGNLVariableExpressionEvaluator.java:117) at ognl