Hello,

I am using Wealth Lab Developer Version 6.9.15, 64-bit Edition on Windows 7 Professional on a notebook with an Intel i7-2640 core and 2x4 GB RAM.
My backtasting data are ASCII, files extension csv and txt, date, 15 min open, high, low, close.

When I ran a test 13 years back with more than 5,000 trades and Windows close Wealth Lab. Below 5,000 trades everything ran good.
I shoose future settings in the toolbox because this is an ES. I also activated Data Manager, ASCII Data, Cache ASCII Data. But the error code stays.

Do you have an explanation?

QUOTE:
using Wealth Lab Developer Version 6.9.15, 64-bit Edition on Windows 7 Professional

So what's the error message?

WW, you're a master of intrigue! :)

I had an eureka moment and think that you may be getting an "out of memory" exception. It's not surprising with ASCII data and a big number of trades. Here are steps to take in order to avoid it:

FAQ | Strategies and WealthScript > Out of memory problems

Most importantly:

1. Disable as many performance visualizers as possible and reopen the strategy window.
2. Optimize strategy code.
3. Minimize RAM usage: close running apps and services.
4. Restart WLD and your PC.

P.S. Renamed the undescriptive title "WealthLab error on Windows 7 whilst testing" to "Out of memory error with 5K+ trades on ASCII data".

The error message is: 'The program do not run properly due to a problem. The program will close and you will be notified if a solution is available.'(translation from german)

I will test your suggestions and write again.

Based on what you're saying now, there's another reason for such runtime crash. You might want to follow this suggestion too:

Errors | General > Wealth-Lab suddenly crashes when backtesting a symbol with large intraday history

I folllowed your last suggestion and now it works. Thank you for support!

Great news to hear. This crash is pretty rare.

At your service.