West Bengal Chief Minister Mamata Banerjee said on Saturday Prime Minister Narendra Modi is aware that demonetisation has "derailed" and he has no solution except for delivering lectures."Modi babu knows that demonetisation (has) now derailed. Except giving bhashan, he has no solution," Banerjee tweeted.The Trinamool Congress supremo said she had earlier accused the Centre of not allowing the Opposition to raise the issue of demonetisation in the Lok Sabha.Modi addressing a farmer's rally in Gujarat on Saturday said "happenings" in the Parliament had "anguished" President Pranab Mukhejee.He was referring to the President's recent criticism of the continued logjam in both the houses of the Parliament over the currency ban.Mukherjee slammed the Opposition for repeated disruptions in the Parliament over the ban of old Rs 500 and 1,000 notes."The government has always said we are ready to debate. I am not being allowed to speak in the Lok Sabha so I am speaking in the Jan Sabha," Modi said at the rally in Gujarat's Deesa town.