Android Studio中的錯誤，而試圖添加一個片段來推算誤差

Question

詳情：

Android Studio 2.1.1 

5:09:32 PM InvalidReferenceException: Error executing FreeMarker template: The following has evaluated to null or missing: 
==> srcDir [in template "root://other/BlankFragment/globals.xml.ftl" at line 7, column 34] 

Tip: If the failing expression is known to be legally null/missing, either specify a default value with myOptionalVar!myDefault, or use when-presentwhen-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)?? 

The failing instruction: 
==> ${srcDir} [in template "root://other/BlankFragment/globals.xml.ftl" at line 7, column 32] (show balloon) 
***When Show balloon is clicked*** 
InvalidReferenceException 
Error executing FreeMarker template: The following has evaluated to null or missing: ==> srcDir [in template "root://other/BlankFragment/globals.xml.ftl" at line 7, column 34] Tip: If the failing expression is known to be legally null/missing, either specify a default value with myOptionalVar!myDefault, or use #if myOptionalVar??>when-present#else>when-missing#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)?? The failing instruction: ==> ${srcDir} [in template "root://other/BlankFragment/globals.xml.ftl" at line 7, column 32] 

Answer 1

如果你面對一個Udacity項目這個問題，這是一個知道是不是BUG：

https://github.com/udacity/ud851-Exercises/issues/67

也有類似問題報告 here和here。

提出的解決方法是：

從項目的build.gradle刪除以下配置，然後點擊同步現在

String osName = System.getProperty("os.name").toLowerCase(); 
if (osName.contains("windows")) { 
    buildDir = "C:/tmp/${rootProject.name}/${project.name}" 
} 

然後再次關閉項目>導入項目。