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I have a players getting this error for any rolls she trys

TypeError: Cannot read property 'substring' of undefined. it started half way through a session and we are all lost on what happened
Roll20 Mod Team
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Edited 1497807684
That error typically is associated with the misuse of Attribute calls (e.g. within a macro). From the Wiki: Attribute calls (e.g. @{AC}) that are not placed within one of tabs of a Character Window (e.g. within a field on the Character Sheet Tab or within an Ability on the Attributes & Abilities Tab ) must use a keyword to let the parser know which Character you intend to call that Attribute from (e.g. @{selected|AC}). Using a Selected Token with a Macro Using a Targeted Token with a Macro My guess is that your player is attempting to use a Collections Macro that contains an Attribute call without a keyword.
Got it, she put {} in her character name
Roll20 Mod Team
Glad the issue was this easy to work out.  Closing this thread as resolved, but if you have any other issues or concerns pop up, please don't hesitate to start a new thread!