Hi, I have the following error with laravel 5.4 when I create an array to add elements and display them in a table
this is the code: 
When I click on add it tells me the following:
I do everything with ajax but it does not let me create the matrix. Someone could help me. I would be grateful
Basically, what you did is create an offset with the array type, which is illegal. You can only have offsets of type string and integer.
Example:
$array = array();
=> []
$counter = array();
=> []
$array[$counter] = 'test';
PHP Warning: Illegal offset type on line 1
First you have:
$acumulador = array();
and then you have
$acumulador++;
I recommend you initialize your variable $acumulador to a whole number.
$acumulador = 0;