Error(s) in re-building vignettes:
  ...
--- re-building ‘clm_article.Rnw’ using Sweave
Warning: (1) Hessian is numerically singular: parameters are not uniquely determined 
In addition: Absolute convergence criterion was met, but relative criterion was not met
Warning: (1) Hessian is numerically singular: parameters are not uniquely determined 
In addition: Absolute convergence criterion was met, but relative criterion was not met
Warning: (1) Hessian is numerically singular: parameters are not uniquely determined 
In addition: Absolute convergence criterion was met, but relative criterion was not met
Warning: (-2) Model failed to converge: degenerate Hessian with 1 negative eigenvalues 
In addition: maximum number of consecutive Newton modifications reached
--- finished re-building 'clm_article.Rnw'

--- re-building ‘clmm2_tutorial.Rnw’ using Sweave
 ----------- FAILURE REPORT -------------- 
 --- failure: the condition has length > 1 ---
 --- srcref --- 
: 
 --- package (from environment) --- 
ordinal
 --- call from context --- 
summary.clmm2(fm2)
 --- call from argument --- 
if (class(vc) == "try-error") {
    warning("Variance-covariance matrix of the parameters is not defined")
    coef[, 2:4] <- NaN
    if (correlation) 
        warning("Correlation matrix is unavailable")
    object$condHess <- NaN
} else {
    sd <- sqrt(diag(vc))
    coef[, 2] <- sd[seq_len(edf - estimStDev)]
    object$condHess <- with(eigen(object$Hessian, only.values = TRUE), 
        abs(max(values)/min(values)))
    coef[, 3] <- coef[, 1]/coef[, 2]
    coef[, 4] <- 2 * pnorm(abs(coef[, 3]), lower.tail = FALSE)
    if (correlation) 
        object$correlation <- (vc/sd)/rep(sd, rep(object$edf, 
            object$edf))
}
 --- R stacktrace ---
where 1: summary.clmm2(fm2)
where 2: summary(fm2)
where 3: eval(expr, .GlobalEnv)
where 4: eval(expr, .GlobalEnv)
where 5: withVisible(eval(expr, .GlobalEnv))
where 6: doTryCatch(return(expr), name, parentenv, handler)
where 7: tryCatchOne(expr, names, parentenv, handlers[[1L]])
where 8: tryCatchList(expr, classes, parentenv, handlers)
where 9: tryCatch(expr, error = function(e) {
    call <- conditionCall(e)
    if (!is.null(call)) {
        if (identical(call[[1L]], quote(doTryCatch))) 
            call <- sys.call(-4L)
        dcall <- deparse(call)[1L]
        prefix <- paste("Error in", dcall, ": ")
        LONG <- 75L
        sm <- strsplit(conditionMessage(e), "\n")[[1L]]
        w <- 14L + nchar(dcall, type = "w") + nchar(sm[1L], type = "w")
        if (is.na(w)) 
            w <- 14L + nchar(dcall, type = "b") + nchar(sm[1L], 
                type = "b")
        if (w > LONG) 
            prefix <- paste0(prefix, "\n  ")
    }
    else prefix <- "Error : "
    msg <- paste0(prefix, conditionMessage(e), "\n")
    .Internal(seterrmessage(msg[1L]))
    if (!silent && isTRUE(getOption("show.error.messages"))) {
        cat(msg, file = outFile)
        .Internal(printDeferredWarnings())
    }
    invisible(structure(msg, class = "try-error", condition = e))
})
where 10: try(withVisible(eval(expr, .GlobalEnv)), silent = TRUE)
where 11: evalFunc(ce, options)
where 12: tryCatchList(expr, classes, parentenv, handlers)
where 13: tryCatch(evalFunc(ce, options), finally = {
    cat("\n")
    sink()
})
where 14: driver$runcode(drobj, chunk, chunkopts)
where 15: utils::Sweave(...)
where 16: engine$weave(file, quiet = quiet, encoding = enc)
where 17: doTryCatch(return(expr), name, parentenv, handler)
where 18: tryCatchOne(expr, names, parentenv, handlers[[1L]])
where 19: tryCatchList(expr, classes, parentenv, handlers)
where 20: tryCatch({
    engine$weave(file, quiet = quiet, encoding = enc)
    setwd(startdir)
    output <- find_vignette_product(name, by = "weave", engine = engine)
    if (!have.makefile && vignette_is_tex(output)) {
        texi2pdf(file = output, clean = FALSE, quiet = quiet)
        output <- find_vignette_product(name, by = "texi2pdf", 
            engine = engine)
    }
}, error = function(e) {
    OK <<- FALSE
    message(gettextf("Error: processing vignette '%s' failed with diagnostics:\n%s", 
        file, conditionMessage(e)))
})
where 21: tools:::.buildOneVignette("clmm2_tutorial.Rnw", "/home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/ordinal.Rcheck/vign_test/ordinal", 
    TRUE, FALSE, "clmm2_tutorial", "UTF-8", "/home/hornik/tmp/scratch/RtmpQb9kDs/file173d7fd864b9.rds")

 --- value of length: 2 type: logical ---
[1] FALSE FALSE
 --- function from context --- 
function (object, digits = max(3, .Options$digits - 3), correlation = FALSE, 
    ...) 
{
    estimStDev <- !("sdFixed" %in% names(as.list(object$call)))
    edf <- object$edf
    coef <- with(object, matrix(0, edf - estimStDev, 4, dimnames = list(names(coefficients[seq_len(edf - 
        estimStDev)]), c("Estimate", "Std. Error", "z value", 
        "Pr(>|z|)"))))
    coef[, 1] <- object$coefficients[seq_len(edf - estimStDev)]
    if (is.null(object$Hessian)) {
        stop("Model needs to be fitted with Hess = TRUE")
    }
    vc <- try(vcov(object), silent = TRUE)
    if (class(vc) == "try-error") {
        warning("Variance-covariance matrix of the parameters is not defined")
        coef[, 2:4] <- NaN
        if (correlation) 
            warning("Correlation matrix is unavailable")
        object$condHess <- NaN
    }
    else {
        sd <- sqrt(diag(vc))
        coef[, 2] <- sd[seq_len(edf - estimStDev)]
        object$condHess <- with(eigen(object$Hessian, only.values = TRUE), 
            abs(max(values)/min(values)))
        coef[, 3] <- coef[, 1]/coef[, 2]
        coef[, 4] <- 2 * pnorm(abs(coef[, 3]), lower.tail = FALSE)
        if (correlation) 
            object$correlation <- (vc/sd)/rep(sd, rep(object$edf, 
                object$edf))
    }
    object$coefficients <- coef
    object$digits <- digits
    varMat <- matrix(c(object$stDev^2, object$stDev), nrow = length(object$stDev), 
        ncol = 2)
    rownames(varMat) <- names(object$stDev)
    colnames(varMat) <- c("Var", "Std.Dev")
    object$varMat <- varMat
    class(object) <- "summary.clmm2"
    object
}
<bytecode: 0x55aa340e13f0>
<environment: namespace:ordinal>
 --- function search by body ---
Function summary.clmm2 in namespace ordinal has this body.
 ----------- END OF FAILURE REPORT -------------- 
Fatal error: the condition has length > 1
SUMMARY: processing the following file failed:
  ‘clmm2_tutorial.Rnw’

Error: Vignette re-building failed.
Execution halted