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Update all modules to last version, created a new empty database (italian language).

Set up TZ = CET/Rome then try to activate Developer Mode

Here the message

Sounds like "Uncaught TypeError: Cannot read property 'prototype' of null" , nothing in log file, so this means error is in web controller.

Can somebody explain every info abot this?

TIA

 

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Use Developer tools with FireFox  to get more details about the error.

Same thing with Chrome use Development Tools ...

 

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