View Compilation Error

0_0_14720926_21601.cpp: In function 'void DFS(int, int)':
0_0_14720926_21601.cpp:23:29: error: too few arguments to function 'void DFS(int, int)'
         if(t != fa)    DFS(t);
                             ^
0_0_14720926_21601.cpp:17:6: note: declared here
 void DFS(int x,int fa)
      ^
0_0_14720926_21601.cpp: In function 'int main()':
0_0_14720926_21601.cpp:144:14: error: too few arguments to function 'void DFS(int, int)'
         DFS(1);          //获得DFS序
              ^
0_0_14720926_21601.cpp:17:6: note: declared here
 void DFS(int x,int fa)
      ^