Why were the proposals of the Cripps' Mission rejected by both the Congress and the Muslim League

The proposals of Cripps' Mission were rejected by the Congress because of the following reasons-

1. The plan involved partitioning the country.
2. The Congress was opposed to the principle of non-accession of the provinces. Gandhiji opposed the Declaration and urged the Working Committee to reject it. Mahatma Gandhi described the Cripps' proposals as a 'post-dated cheque on a failing bank.'
3. The Congress wanted that all Subjects, including Defence should be handed over to the National Government. The Congress insisted on the immediate formation of a National Government with full responsibility.

The proposals of Cripps' Mission were rejected by the Muslim League because the League opposed the creation of a single union. The proposals did not accept Pakistan specifically. They did not grant the right of self-determination to Muslims.