[R-meta] GLMM issue with metaprop / meta package

[Richter Dirk]

Hi everybody,
I've tried to use the GLMM method with the meta - metaprop command:
m1 <- metaprop(event, n, studlab=paste(author, pubyear), data=metadata, method = "GLMM")

However, it prompted the following error:
Error in runGLMM(list.prop, method.tau = method.tau, method.random.ci = method.random.ci,  : 
  Error in (function (ai, bi, ci, di, n1i, n2i, x1i, x2i, t1i, t2i, xi,  : 
  Cannot fit ML model (set 'verbose=TRUE' to obtain further details).

The alternative 'Inverse' method runs smoothly.
Any suggestions or errors on my side?
Thanks,
Dirk

Berner Fachhochschule / Haute école spécialisée bernoise
Departement Gesundheit / Département Santé
Fachbereich Pflege / Division Soins infirmiers

Prof. Dr. Dirk Richter
Psychiatrische Rehabilitationsforschung
Leitung Innovationsfeld 'Psychische Gesundheit und psychiatrische Versorgung'
------------------------------------------------------------
Murtenstrasse 10, CH-3008 Bern
Telefon direkt +41 31 848 37 68
dirk.richter using bfh.ch
https://www.bfh.ch/de/ueber-die-bfh/personen/bbnczalphux2/

Bern University of Applied Sciences
Department of Health Professions, Division of Nursing
Psychiatric Rehabilitation Research
Prof. Dirk Richter, RN, Dr. phil., PhD
E-Mail: dirk.richter using bfh.ch