JSP cannot be resolved to a type error reporting solution

Today html Convert to jsp When eclipse Report errors JSP cannot be resolved to a type;
After checking the code, there is no problem , Under the baidu , It is said that two bags are missing . Then the specific and simple operation process is as follows ：

Right click on the item to find Properties Operate as shown in the following figure , As for why, it will be updated and excavated in the future .