What is Multihread apartment? how to solve this issue

[chris_chua]

Hi All,

i receive the error below,  how to resolve this issue if i want it to run at the same time?

Library function error (return value==-180)

The dialog cannot be displayed in a thread whose concurrency model is multithread apartment(MTA)

Thanks 🙂

[RobertoBozzolo]

The threading model has to do with how events are processed in multithread applications,  mainly when ActiveX objects are involved: here you can find an explanation if you want to deep into it. Apparently you are running into this error because you are calling some file dialogue in a multithread application that is using the wrong model: look at the notes given in the help, this is for example the page for .

[chris_chua]

noted thanks for advice