The Constitution of the Democratic Socialist Republic of Sri Lanka be accompanied by an oath or affirmation, as the case may be, in the form set out in the Seventh Schedule, taken and subscribed or made and subscribed, as the case may be, by the person nominated to such vacancy. Upon the receipt of such nomination, accompanied by such oath or affirmation the Commissioner] shall declare such person to be the Member for the electoral district in respect of which the vacancy occurred: 148 [Provided that where the Secretary of such political party fails to nominate a member of such political party to fill such vacancy under the preceding provisions of this sub-paragraph 149[within thirty days of his being required to do so and in the aforesaid manner] or where the Secretary of a political party had been required, before the coming into force of this proviso, to nominate a member of such political party to fill any such vacancy under such provisions and such Secretary fails, within thirty days of the coming into force of this proviso, to nominate a member of such political party to fill such 150 [vacancy, or where such political party is deemed to be prescribed under Article 157(a), then, the Commissioner of Elections] shall forthwith so inform the President, who shall, within thirty days of the receipt by him of such information, by Notice published in the Gazette order the Commissioner of Elections to hold an election for the electoral district in respect of which such vacancy has occurred. The Commissioner of Elections shall thereupon hold an election, in accordance with Part I and Parts IV to VI (both inclusive) of the Ceylon (Parliamentary Elections) Order in Council, 1946, for such electoral district as existed 148 - Inserted by the Fifth Amendment to the Constitution Sec. 2(b). 149 - Substituted by the Sixth Amendment to the Constitution, Sec. 4(2)(a), for “within thirty days of his being required to do so”. 150 - Substituted by the Sixth Amendment to the Constitution Sec. 4(2)(b), for “vacancy, then the Commissioner of Elections”. 151