exception in verse.map.mapposttick: system.invalidoperationexception: collection was modified; enumeration operation may not execute. [ref beb22b36] at system.throwhelper.throwinvalidoperationexception (system.exceptionresource resource) [0x0000b] in <eae584ce26bc40229c1b1aa476bfa589>:0 at system.collections.generic.list`1+enumerator[t].movenextrare () [0x00013] in <eae584ce26bc40229c1b1aa476bfa589>:0 at system.collections.generic.list`1+enumerator[t].movenext () [0x0004a] in <eae584ce26bc4