sh: fork: Resource temporarily unavailable

hi
I have a template for 50MB html sites. no mysql, no php
then for this domain I upgraded by switching templates to a normal default one I sell, with mysql, php and 300mb space.

when trying to install joomla, this error comes up sh: fork: Resource temporarily unavailable

also i noticed I had to manually change the disk quota.

I ran some commands to see that its not serverwide. I made a test with another domain and I could install joomla as normal.

any ideas why this is happening when upgrading a domain by switching server template?

thank you

Status: 
Closed (fixed)