I want to add multiple composite objects in an environment at once, here is the code snippet Code: <worldbody> <body name="B1"> <composite type="grid" count="9 9 1" spacing="0.05" offset="0 0 1"> <skin rgba=".1 .8 .1 1" inflate="0.001" subgrid="3"/> <pin coord="0 0"/> <pin coord="8 0"/> <geom size=".02"/> </composite> </body> <body name="B2"> <composite type="grid" count="9 9 1" spacing="0.05" offset="0 2 1"> <skin rgba=".1 .8 .1 1" inflate="0.001" subgrid="3"/> <pin coord="0 0"/> <pin coord="8 0"/> <geom size=".02"/> </composite> </body> </worldbody> trying to load this environment into ./simulate gives the following error What is the workaround for this ?