# Virtual graph tutorial not working on windows machine **URL:** \ **Category:** Stardog Studio\ **Created:** [March 29, 2022, 9:04pm UTC](https://community.stardog.com/t/virtual-graph-tutorial-not-working-on-windows-machine/3649 "2022-03-29T21:04:50Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![R3000](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.stardog.com/r3000/32/358_2.png) [@R3000](https://community.stardog.com/u/R3000)\ **Post date:** [March 29, 2022, 9:04pm UTC](https://community.stardog.com/t/virtual-graph-tutorial-not-working-on-windows-machine/3649/1 "2022-03-29T21:04:50Z")
I have tried both in studio using UI and command line the following line from this tutorial > **[Using Virtual Graphs](https://docs.stardog.com/tutorials/using-virtual-graphs)** > > Learn how to create and query virtual graphs over relational data in Stardog. - Has anyone tried this on Windows 10? In Sudio UI I am getting the following error: ![image](https://canada1.discourse-cdn.com/flex030/uploads/stardog/original/2X/1/1f3e7f9fcd7c766fdca0d210cd220f72b2d1f368.png) And for command line I am getting this error: ```auto C:\stardog-7.7.2\bin>stardog-admin virtual add music.properties music_mappings.ttl Unrecognized VM option 'UseParallelOldGC' Did you mean '(+/-)UseParallelGC'? Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. ``` ---
**Author:** ![R3000](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.stardog.com/r3000/32/358_2.png) [@R3000](https://community.stardog.com/u/R3000)\ **Post date:** [March 29, 2022, 9:08pm UTC](https://community.stardog.com/t/virtual-graph-tutorial-not-working-on-windows-machine/3649/2 "2022-03-29T21:08:00Z")
Worth noting that in Studio UI if I don't use contents of mapping.ttl - but leave the "Generate" mappings - the vanilla virtual graph is created just fine - but not useful. ![image](https://canada1.discourse-cdn.com/flex030/uploads/stardog/original/2X/2/224080512db7438dd5c11ec7c90a1f7462d93a50.png)