Incorrect ref formatting 
The references, used in prior text defined as: 

{{singlechart|UKrandb|1|artist=Rihanna|song=Russian Roulette|date=December 12, 2009|accessdate=March 27, 2013}}{{singlechart|UK|2|artist=Rihanna|song=Russian Roulette|date=December 12, 2009|accessdate=March 27, 2013}}

show incorrect results: 

83. ^ |UK R&B; (Official Charts Company) |align="center"|1

84. ^ |UK Singles (Official Charts Company) |align="center"|2

Cite error:  tag with name "sc_UKrandb_Rihanna" defined in  is not used in prior text (see the help page).

Cite error:  tag with name "sc_UK_Rihanna" defined in  is not used in prior text (see the help page).

What's wrong? Thx   
It thinks you have incorrectly defined a named reference. Did you take a look at the help page?   
Was not helpful: Where can I find something to {{singlechart|UK|2|artist=Rihanna|song=Russian Roulette|date=December 12, 2009|accessdate=March 27, 2013}}?   
I think I see the problem now. Swap the nowiki and ref tags around and swap the end tags around as well. It should then put the whole lot into a reference.   
Please be so kind and do it on Rated R (Rihanna album) - I can't, I tried everything. Thanks al lot.   
I will be more than happy to do so when I get back from work )   
Answered at Help talk:Cite errors.
 is not intended for this purpose. It creates a table row, so it needs to be included in a table. It also creates a reference, so you are essentially nesting  tags, which does not work. Please read the  documentation or use another method to include these references.    talk