nothing happens

After I installed the plugin, I paste the name of plugins that I want to install in the textarea, and click “install”, and the plugin asked me my ftp creditentials, and I click on “proceed”, and then nothing…
I had to change the WP_DEBUG to true to see that there were a problem with the creation of the mpi file : ‘Cannot open file: xxxxxxxxx.mpi’.
Then I created manually the folders /mpi_logs/ and /mpi_logs/files/, and the plugin could create the mpi file.

But it still doesn’t work, and I don’t have a message for the error.

https://wordpress.org/plugins/multi-plugin-installer/