* installing *source* package ‘deisotoper’ ... ** package ‘deisotoper’ successfully unpacked and MD5 sums checked ** using staged installation ** R ** inst ** byte-compile and prepare package for lazy loading ** help *** installing help indices ** building package indices ** installing vignettes ** testing if installed package can be loaded from temporary location Warning in fun(libname, pkgname) : NAs introduced by coercion Error: package or namespace load failed for ‘deisotoper’: .onAttach failed in attachNamespace() for 'deisotoper', details: call: if (jvn < 1.8) stop("Java 8 is needed for this package but not available") error: missing value where TRUE/FALSE needed Error: loading failed Execution halted ERROR: loading failed * removing ‘/Users/ripley/R/packages/tests-devel/deisotoper.Rcheck/deisotoper’