Hi, 

I am trying to download TCGA biolinks and for some reason I keep getting error message

I don't understand what the problem is because I have used it to download data from TCGA with no problem just a few weeks ago. The warning I am getting is this:

Error: package or namespace load failed for ‘TCGAbiolinks’ in loadNamespace(j <- imp[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 there is no package called ‘GenomicAlignments’
In addition: Warning message:
package ‘TCGAbiolinks’ was built under R version 3.4.1 

Can anybody help me figuring out what the problem is? 

Thanks for your input!

Yes.

 there is no package called ‘GenomicAlignments’

means that there is no package called GenomicAlignments installed in your version of R, so you need to install GenomicAlignments.