1.3.4 Added language: Spanish ???

It’s there, and appears to be complete. I assume that you’re running WordPress in Spanish, so it should be picking it up.

I’m not sure what to suggest; do other plug-ins you have installed with Spanish support show up as translated?

Yes the WordPress is in Spanish, and others plugins are translated.

This doesn’t seem like the same problem, but can you try the change by Maxunit in a separate support thread and let me know if it fixes the issue?

https://www.ads-software.com/support/topic/error-warning-on-activating-plugin?replies=16#post-5766518

I tried but don’t work.

I have wordpress installed in a folder “/wp/…” and try this

load_plugin_textdomain( ‘content-progress’, false, dirname( plugin_basename( __FILE__ ) . ‘./wp/lang‘ ) );

But don’t work.

The only solution its copy language files in wp-content/languages/plugins/

Did you create that directory? Is it something some other resource suggested? I’ve never heard of something like that; it’s not a normal way of handling plugin translations, and I have no idea why my plugin would be able to find that directory. Do you have any plugins installed specifically for handling translations?

Yes I install wordpress in this folder.
Don’t have plugins for translations.

That wasn’t my question; you said that your solution was to copy the language file into “wp-content/languages/plugins/” — and I don’t know what that directory is, or what is managing it.