Syntax error in 'with' with SQL Server

Have the following error in sql server:

  

Incorrect syntax near the keyword 'with'. If this statement is a common table expression, an xmlnamespaces clause or a change tracking context clause, the previous statement should be terminated with a semicolon

What can it be?

Follow the code:

  declare @data date='2018-05-21'

  With SomaDebCred AS (
  SELECT ContabLancNumCtrl, 
   sum(case when ContabLancCtaCred is not null then ContabLancValor else 0 
  end) as soma_debito,
   sum(case when ContabLancCtaDeb is not null then ContabLancValor else 0 
  end) as soma_credito
  from CONTAB_LANCAMENTO
  where ContabLancData = @data
    and EmpCod='01.02'
  group by ContabLancNumCtrl

 ),
 NomeClientes AS (
 SELECT A.ContabLancNumCtrl, A.soma_debito, A.soma_credito,
   L.ContabLancValor, L.ContabLancHistComp,
   L.ContabLancCtaCred, L.ContabLancCtaDeb
 from SomaDebCred as A
   inner join CONTAB_LANCAMENTO as L on L.ContabLancNumCtrl = 
   A.ContabLancNumCtrl
   where A.soma_debito <> A.soma_credito

   )

  SELECT * FROM SomaDebCred
   UNION ALL
   SELECT * FROM NomeClientes