error 324 ERR_EMPTY_RESPONSE when installing thresholds

[bny]

Hi,

I've just installed the "settings" plugin successully.
I'm now trying to install the "Thresholds" plugin but I'm getting error 324 ERR_EMPTY_RESPONSE each time I click on the "install" link of Thresholds within the "Plugin management" page.
Within my ""Plugin management" page, I now have Thresholds showing up as many times as I tried to install it.

I' running Cacti version 0.8.7e. My plugin architecture release is 2.6.

In advance, thanks for your help.

BNY