workshared RVT won't work

[bim2016]

attached pls find the stripped RVT, and output Excel file after i added "if (category)" in code, looks like it's related to levels in workshared RVT, non-worksharing RVT works OK, another finding is that if i changed levels workset from "Shared Levels and Grids" to "Workset1", then it runs infinite loop at "Downloading hierarchy...", thanks. Joe

NEX1075_HSK_ARC_STN_WIP_A.rvt (2) (1).xlsx