Hello. I have a problem with addon_calendario.php, I can't install I see a message error.

Post the code here. I never saw this addon ;)

I still didn't take time to verify/update this add-on, as it's not purely mine, but I don't think there is something specific to not work with miniBB.
I must try to check it later.

Also, really - what kind of error do you get on the way?

Where I put the iframe do not see the calendar and a message just says error

One word? Just "Error"?
That should not come from miniBB.

the message is "Fatal error".

I install the addon and don't have this error (V 3.0) after installation. The search result is not quite right, but It works on a few changes in the code as it is. So I think that the error does not come from the script itself.

That means that somewhere DEFINED776 variable is not set... I'll take a look later.

Jaime
Can you see the calendar online? I see good all the forum, but where is the iframe aparears the notice Fatal error

See here You found last posts 29.04 or 04.05 and last topics 16 or 17.03.

And I have not changed in the addon_calendario.php, only $searchTopics=FALSE; and only installed as described in readme-file. (Everything on the V 2.5, but it works just under V 3.0 (which I have now but not online))

Well I can not see the calendar, as is necessary to apply some kind of permission to the folder calendario?

No special permissions are required.
Just follow installation instructions more carefully.