Enterprise Portal Error, Event ID 100

I am getting this error in my event log:

System.ArgumentException

  at Microsoft.Dynamics.Framework.Portal.UI.WebControls.WebParts.TimePeriodsHelper.Microsoft.Dynamics.Framework.Portal.UI.WebControls.WebParts.ITimePeriodsHelper.IsCurrentTimePeriod(String timePeriodsName)

  at Microsoft.Dynamics.Framework.Portal.UI.WebControls.WebParts.IndicatorMdxQueryBuilder..ctor(Indicator indicator, String company, String currencyCode, List`1 filterProviders, ITimePeriodsHelper timePeriodsHelper)

  at Microsoft.Dynamics.Framework.Portal.UI.WebControls.WebParts.CubeHelper.GetMdx(Indicator indicator, String company, String currencyCode, ISession session, List`1 filterProviders, Boolean& isTimePeriodQuery)

  at Microsoft.Dynamics.Framework.Portal.UI.WebControls.WebParts.BusinessOverviewWebPart.CreateRow(Indicator indicator, Int32 indicatorIndex, String company, String currencyCode, String currencySymbol, String cssClass, NumberFormatInfo numInfo)

Otherwise I have normal use of EP, Role Center, etc.