If default suggestions doesn't work, you may try to do the following:
Backup firstly your .rvsitebuilder/ folder
cp -rp .rvsitebuilder .rvsitebuilder_bk
rm -rf /home/USERNAME/.rvsitebuilder/cache/*
rm -fv /home/USERNAME/.rvsitebuilder/tmp/*
Notes
If default suggestions doesn't work, you may try to do the following:
Backup firstly your .rvsitebuilder/ folder
cp -rp .rvsitebuilder .rvsitebuilder_bk
rm -rf /home/USERNAME/.rvsitebuilder/cache/*
rm -fv /home/USERNAME/.rvsitebuilder/tmp/*