diff --git a/core/lspserver.py b/core/lspserver.py
index b7ca4646fa..640acde447 100755
--- a/core/lspserver.py
+++ b/core/lspserver.py
@@ -112,10 +112,15 @@ def send_response(self, request_id, result, **kwargs):
         ), **kwargs)
 
     def send_message(self, message: dict):
-        json_content = json.dumps(message)
+        # message_type is not valid key of JSONRPC, we need remove message_type before send LSP server.
+        message_type = message.get("message_type")
+        message.pop("message_type")
 
+        # Parse json content.
+        json_content = json.dumps(message)
         message_str = "Content-Length: {}\r\n\r\n{}".format(len(json_content), json_content)
 
+        # Send to LSP server.
         self.process.stdin.write(message_str.encode("utf-8"))    # type: ignore
         self.process.stdin.flush()    # type: ignore
 
@@ -123,8 +128,6 @@ def send_message(self, message: dict):
         # So we need INLAY_HINT_REQUEST_ID_DICT to contain documentation path to send retry request.
         record_inlay_hint_request(message)
 
-        message_type = message.get("message_type")
-
         if message_type == "request" and \
            not message.get('method', 'response') == 'textDocument/documentSymbol':
             log_time("Send {} request ({}) to '{}' for project {}".format(
diff --git a/langserver/terraform-ls.json b/langserver/terraform-ls.json
index 56c27684ac..9f77566f21 100644
--- a/langserver/terraform-ls.json
+++ b/langserver/terraform-ls.json
@@ -2,7 +2,8 @@
   "name": "terraform-ls",
   "languageId": "terraform",
   "command": [
-    "terraform-ls"
+    "terraform-ls",
+    "serve"
   ],
   "settings": {}
 }