R help - Apr 2007 - Error in geweke.diag function of coda package

Hi R users, 

Does anybody knows for the following erro after running 

geweke.diag(MCMC.sampled, frac1=0.1, frac2=0.5) 


Erro em glm.fit(x = X, y = Y, weights = weights, start = start, etastart = 
etastart,  : 
	la??o interno 1; n??o ?? poss??vel corrigir o tamanho do passo 
Al??m disso: Warning messages: 
1: algoritmo n??o convergiu in: glm.fit(x = X, y = Y, weights = weights, 
start = start, etastart = etastart, 
2: algoritmo n??o convergiu in: glm.fit(x = X, y = Y, weights = weights, 
start = start, etastart = etastart, 
3: algoritmo n??o convergiu in: glm.fit(x = X, y = Y, weights = weights, 
start = start, etastart = etastart, 
4: algoritmo n??o convergiu in: glm.fit(x = X, y = Y, weights = weights, 
start = start, etastart = etastart, 
5: tamanho do passo truncado por causa de diverg??ncia 

Thanks for any help. 

Gilberto Matos.