Just to follow up, all of these scripts reference HtmlBuilder, so if you had one of them installed, you would need to have the HtmlBuilder script also installed: TokenController StatusTracker ItsATrap_theme_BurnBryte HtmlBuilder ItsATrap_theme_DnD3.5 Its A Trap ItsATrap_theme_WoDClassic WelcomePackage ItsATrap_theme_GammaWorld7 CheckItOut Hexploration CarryTokens Earthdawn (FASA Official) character sheet companion ItsATrap_theme_Starfinder ItsATrap_theme_Pathfinder AreasOfEffect ItsATrap_theme_RoleplayingIsMagic4 MarkerManager Installing them should have pulled in that dependency. If it didn't, there might have been a problem with the SandBox that prevented it (like having a script with that name already that doesn't provide the same facility), or they may have the dependency mis-specified in their script.json. I'll try to remember to investigate that. In general, if you see a Reference Error in the API with a 1-click script, you can be almost certain that there is another script you need to install.