Unable to compile class for JSP decorator

The decorator is decorated with INDEX. JSP on the target page. Suddenly

The error "Unable to compile class for JSP" is reported.

[Java]
<Span style = "font-size: 18px;"> <%
String path = request. getContextPath ();
String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/";
%> </Span>

Then it is normal. I don't need this! Therefore, this problem must be solved.

This error may be caused by many reasons. But it is mainly repeated. Later, we found that these two sentences already exist on the homepage of the decorator. Therefore, conflicts may occur when these two sentences exist on any contained pages. Already defined. Remove these two sentences from the homepage.