change findPlug method that is deprecated for maya 2019
@@ -1834,7 +1834,7 @@ AssetNode::createAsset()
// if the asset has been frozen. and DeferAssetLoad in on
// and we're reading a file, don't load the assets
MFnDependencyNode assetNodeFn(thisMObject());
- MPlug frozenPlug = assetNodeFn.findPlug("frozen");
+ MPlug frozenPlug = assetNodeFn.findPlug("frozen", true);
bool frozen = frozenPlug.asBool();
int defer = MGlobal::optionVarIntValue("houdiniEngineDeferAssetLoad");
