Wrong khata no. and khesra no. in sale deed

in 2011, i bought 5 cottahs of land in Bihar from my uncle. it was ancestral land and it was in uncle's share. In 2016, i sold the land to three parties. later on i realised i have mentioned wrong khata khasra in the sale deed. the khata khasra was wrong in the original sale deed too. what can be done now? stamp duty will be required to be paid again? the wrong Khata khasra is of another uncle property. and the executor of the original sale deed has since gone abroad and is in bad health. what can be done? will fresh stamp duty be needed? thanks in advance.