update cmakelists

example/windows/flutter/CMakeLists.txt

@@ -91,6 +91,7 @@ add_custom_command(
     ${FLUTTER_TOOL_ENVIRONMENT}
     "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.bat"
       windows-x64 $<CONFIG>
+  VERBATIM
 )
 add_custom_target(flutter_assemble DEPENDS
   "${FLUTTER_LIBRARY}"

lib/isolate.dart

@@ -253,7 +253,7 @@ class IsolateQjs {
       'port': evaluatePort.sendPort,
     });
     var result = await evaluatePort.first;
-    if (result['data'] != null)
+    if (result['error'] == null)
       return _decodeData(result['data'], sendPort);
     else
       throw result['error'];