Troubleshoot one by one. If it can't power even one pedal, it's obviously faulty. If it powers one pedal, then slowly add the rest till you located the problem.
Powering pedals by wall adaptor, you must be very careful, especially the requirements and polarity. If you don't know such things, get someone experienced to explain to you. If you still don't understand, get someone to wire it up for you and do a matching system labeling for the connectors and stick to that.
If you cause a short/overload condition, you might damage your pedal or the supply adaptor. Electronics is one way, damage is damage, no tomorrow will be better kind of thing.
Still cannot, buy a new one, lah. These kind of things not worth repairing.
Additional information: 1spot uses switching power supply technology. Which is more advanced than the traditional transformer only stepdown. Benefits, is autovoltage, lightweight, compact, some short circuit protection, efficient, high current to weight ratio. Disadvantage is less robust than a good transformer system, expected lifespan shorter as more components possible to failure, higher cost, not economical for small current requirements.