title: Could not make proto path relative and No such file or directory
body: <pre><code>go-dev
   -blog
    -blog-server
    -blogpb
      - blog.proto
   -other 
   -dart
  </code></pre>
  
  <p>i have a directory like that on my project <code>blogpb</code> is the directory where i create <code>.proto</code> file to <code>dart</code> directory, 
  when i run this command: </p>
  
  <pre><code> protoc -I=. --dart_out=$DST_DIR $SRC_DIR/blogpb/blog.proto  
   // got : Could not make proto path relative: /blogpb/blog.proto: No such file or directory
  
   protoc --dart_out=grpc:lib/src/generated -Iprotos greet/greetpb/greet.proto
   // got : protos: warning: directory does not exist.
   //       Could not make proto path relative: greet/greetpb/greet.proto: No such file or directory
  </code></pre>
  
  <p>what is the wrong command above ? and how to create the <code>generated</code> into <code>dart</code> directory for this?</p>