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If you installed a new MAMP, your default setting are too low. You have to edit the correct .INI file of your chosen PHP version! It should be located here:

Example for php7.1.8

Applications/MAMP/bin/php/php7.1.8/conf/php.ini

Edit the file and search for:

memory_limit = 32M

I would suggest a value of 512M instead. Save the file. 
Unlimited memory: set 

memory_limit = -1

You can check if this value has been updated by cd-ing into the htdocs folder and 

php -i | grep memory_limit

Restart the server/MAMP app