Running examples in ‘microsynth-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: microsynth
> ### Title: Synthetic control methods for micro- and meso-level data.
> ### Aliases: microsynth
> 
> ### ** Examples
> 
> # Use seattledmi, block-level panel data, to evaluate a crime intervention.
> # Declare time-variant (outcome) and time-invariant variables for matching
> cov.var <- c('TotalPop', 'BLACK', 'HISPANIC', 'Males_1521',
+        'HOUSEHOLDS', 'FAMILYHOUS', 'FEMALE_HOU', 'RENTER_HOU', 'VACANT_HOU')
> 
> 
> # Generate weights only (for four variables)
> match.out <- c('i_felony', 'i_misdemea', 'i_drugs', 'any_crime')
> 
> 
> # Apply microsynth in the traditional setting of Synth
> # Create macro-level (small n) data, with 1 treatment unit
> set.seed(86872)
> ids.t <- names(table(seattledmi$ID[seattledmi$Intervention==1]))
> ids.c <- names(table(seattledmi$ID[seattledmi$Intervention==0]))
> ids.synth <- c(base::sample(ids.t, 1), base::sample(ids.c, 100))
> seattledmi.one <- seattledmi[is.element(seattledmi$ID,
+            as.numeric(ids.synth)), ]
> 
> 
> # Apply microsynth to the new macro-level data
> # runtime: < 5 minutes
> sea8 <- microsynth(seattledmi.one, idvar='ID', timevar='time',
+            intvar='Intervention',
+            start.pre=1, end.pre=12, end.post=16,
+            match.out=match.out[4],
+            match.covar=cov.var, result.var=match.out[4],
+            plot.var=match.out[4], test='lower', perm=250, jack=FALSE,
+            check.feas=TRUE, use.backup=TRUE)
WARNING: There is a low number (1) of cases in the treatment or intervention group.
Setting use.survey = FALSE.
Be cautious of results involving linearization or confidence intervals.

Calculating weights...
Resetting perm = 100
Checking feasibility of first model...
Error in dyn.load(file, DLLpath = DLLpath, ...) : 
  unable to load shared object '/home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/LowRankQP/libs/LowRankQP.so':
  /home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/LowRankQP/libs/LowRankQP.so: failed to map segment from shared object
Calls: microsynth ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>
Execution halted