CMake Error at .*/Modules/ExternalData.cmake:[0-9]+ \(message\):
  ExternalData_SERIES_PARSE is set to

    NotASeriesRegex

  which is not of the form

    \(<number>\)\(<suffix>\)\$

  Fix the regular expression or set variables

    ExternalData_SERIES_PARSE_PREFIX = <prefix> regex group number, if any
    ExternalData_SERIES_PARSE_NUMBER = <number> regex group number
    ExternalData_SERIES_PARSE_SUFFIX = <suffix> regex group number

Call Stack \(most recent call first\):
  .*
  BadSeries1.cmake:3 \(ExternalData_Expand_Arguments\)
  CMakeLists.txt:3 \(include\)