显然，这里面有......一个变量的引用转换到一个变量（$ {} project_path）的引用问题（$ {workspace_loc}）。

Obviously, it has problems translating a reference to a variable (${project_path}) inside ... a reference to a variable (${workspace_loc}).

您可以尝试在$ {} build_project变量，而不是

You could try the ${build_project} variable instead

${build_project:/build.xml}

我希望它能帮助。

I hope it helps.