ASCII-error-getting-history-Collection-was-modified

I also see this:



Out of curiosity:

1) Are you using Intraday or daily ASCII data ?
2) Do you only see this error when using 'Portfolio Backtest?' (i.e. if you run a backtest on 'Single Symbol' for one of these 'bad' symbols, does it run fine ?)

1) Daily data
2) I have not investigated this with a single symbol so I don't know. I have been noticing it with Portfolio Backtest and have attempted to identify the source of the problem myself, without any success

Can you open the log window and paste the stack trace? Either way I think I have a handle on it so let's see if this is resolved for you in Build 134.

Here it is:

9/2/2025 08:27:40:186
ASCII
Error getting History (MCHP): Collection was modified; enumeration operation may not execute.
InvalidOperationException
Collection was modified; enumeration operation may not execute.
at System.Collections.Generic.Dictionary`2.Enumerator.MoveNext()
at WealthLab.Data.AsciiProvider.SupportsScale(HistoryScale scale)
at WealthLab.Data.HistoricalDataValet.DisableConfiguration(String first, HistoryScale connection, DateTime consumer, DateTime visitor2, Int32 max_item3, IHistoryProvider cust4, DataRequestOptions key5)

Thanks Glitch!