Heres the error log 
[09:33:28.199 - Plugin_AnimationEditor.rbxm.AnimationEditorRigBuilder.AnimationEditor.Code.UtilityScripts.UtilityScriptDisplayArea:36: attempt to index nil with 'AbsolutePosition']
09:33:28.201 - Stack Begin
[09:33:28.201 - Script 'Plugin_AnimationEditor.rbxm.AnimationEditorRigBuilder.AnimationEditor.Code.UtilityScripts.UtilityScriptDisplayArea', Line 36 - function absoluteXPositionToTime]
[09:33:28.202 - Script 'Plugin_AnimationEditor.rbxm.AnimationEditorRigBuilder.AnimationEditor.Code.GUIScripts.GUIScriptNotchesDisplayArea', Line 35 - function calculateDisplayArea]
[09:33:28.202 - Script 'Plugin_AnimationEditor.rbxm.AnimationEditorRigBuilder.AnimationEditor.Code.GUIScripts.GUIScriptNotchesDisplayArea', Line 121 - function createNotches]
[09:33:28.202 - Script 'Plugin_AnimationEditor.rbxm.AnimationEditorRigBuilder.AnimationEditor.Code.GUIScripts.GUIScriptNotchesDisplayArea', Line 157 - function initNotches]
[09:33:28.203 - Script 'Plugin_AnimationEditor.rbxm.AnimationEditorRigBuilder.AnimationEditor.Code.GUIScripts.GUIScriptNotchesDisplayArea', Line 168 - function init]
[09:33:28.203 - Script 'Plugin_AnimationEditor.rbxm.AnimationEditorRigBuilder.AnimationEditor.Code.UtilityScripts.UtilityScriptPluginSetup', Line 96 - function initializeScripts]
[09:33:28.204 - Script 'Plugin_AnimationEditor.rbxm.AnimationEditorRigBuilder.AnimationEditor.Code.UtilityScripts.UtilityScriptPluginSetup', Line 324 - function populateEditor]
[09:33:28.204 - Script 'Plugin_AnimationEditor.rbxm.AnimationEditorRigBuilder.AnimationEditor.Code.UtilityScripts.UtilityScriptRigSelection', Line 186 - function showEditor]
[09:33:28.205 - Script 'Plugin_AnimationEditor.rbxm.AnimationEditorRigBuilder.AnimationEditor.Code.UtilityScripts.UtilityScriptRigSelection', Line 199 - function loadAnimatedModel]
[09:33:28.205 - Script 'Plugin_AnimationEditor.rbxm.AnimationEditorRigBuilder.AnimationEditor.Code.UtilityScripts.UtilityScriptRigSelection', Line 253 - function selectRig]
[09:33:28.206 - Script 'Plugin_AnimationEditor.rbxm.AnimationEditorRigBuilder.AnimationEditor.Code.UtilityScripts.UtilityScriptRigSelection', Line 272]