New Post: Use of drc library, instability ?

Hello, thank you for helping me.

This mistake is repaired. Now during the first test, my application works, but if I test it a second time just after, it doesn't works, stopping at "library(drc)" step. I think it is a problem linked with the closing of R, but nothing can prove it, not in task manager neither in my code.
But after several minutes, the application works again ...