Could you give the full error message? It should have told you what it was expecting. Given that information, it may have been caused by a component or Tech Area stating there was 3 Requirements, when there actually were 4 listed.
v 1.1 will be checking the data for fields with limited valid values.
Example:
Vehicle Type in the Components.txt file
It will also give the option to create an output file listing all of your components in order by Family, though the SE Modder utility does this graphically which is far better.
The run-time error is on startup of the program (that's the full text of the error in my post below). It didn't happen until after I made a fix to one of the entries. It sounds like an internal program error from the description. Anyway I'm using XP Pro sp2.