Hi everybody, I have actually weird situation. my Gviz script was working perfectly but after I updated my R version I am getting the following error message after running plotTracks:

> plotTracks(list(idxTrack, axTrack , cp, gc,gckd, ct, be, su, refGenes),
                from=from, to=to, showTitle=T,showId=T, scale=0.1)    
Error in (function (classes, fdef, mtable)  : 
      unable to find an inherited method for function 'displayPars<-' for signature '"character", "list"'

I changed nothing .. and I don't know what went wrong. does anyone have an experience with such error.

> sessionInfo()
R version 3.3.1 (2016-06-21)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.11.6 (El Capitan)

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
 [1] grid      parallel  stats4    stats     graphics  grDevices utils     datasets 
 [9] methods   base     

other attached packages:
[1] lattice_0.20-34      Gviz_1.16.5          GenomicRanges_1.24.3 GenomeInfoDb_1.8.7  
[5] IRanges_2.6.1        S4Vectors_0.10.3     BiocGenerics_0.18.0  BiocInstaller_1.22.3

loaded via a namespace (and not attached):
 [1] SummarizedExperiment_1.2.3    VariantAnnotation_1.18.7     
 [3] splines_3.3.1                 colorspace_1.2-6             
 [5] htmltools_0.3.5               rtracklayer_1.32.2           
 [7] GenomicFeatures_1.24.5        chron_2.3-47                 
 [9] interactiveDisplayBase_1.10.3 survival_2.39-5              
[11] XML_3.98-1.4                  foreign_0.8-67               
[13] DBI_0.5-1                     ensembldb_1.4.7              
[15] BiocParallel_1.6.6            RColorBrewer_1.1-2           
[17] matrixStats_0.50.2            plyr_1.8.4                   
[19] zlibbioc_1.18.0               Biostrings_2.40.2            
[21] munsell_0.4.3                 gtable_0.2.0                 
[23] latticeExtra_0.6-28           Biobase_2.32.0               
[25] biomaRt_2.28.0                httpuv_1.3.3                 
[27] AnnotationDbi_1.34.4          Rcpp_0.12.7                  
[29] xtable_1.8-2                  acepack_1.3-3.3              
[31] BSgenome_1.40.1               scales_0.4.0                 
[33] Hmisc_3.17-4                  XVector_0.12.1               
[35] mime_0.5                      Rsamtools_1.24.0             
[37] gridExtra_2.2.1               AnnotationHub_2.4.2          
[39] ggplot2_2.1.0                 digest_0.6.10                
[41] biovizBase_1.20.0             shiny_0.14                   
[43] tools_3.3.1                   bitops_1.0-6                 
[45] RCurl_1.95-4.8                RSQLite_1.0.0                
[47] dichromat_2.0-0               Formula_1.2-1                
[49] cluster_2.0.4                 Matrix_1.2-7.1               
[51] data.table_1.9.6              httr_1.2.1                   
[53] R6_2.1.3                      rpart_4.1-10                 
[55] GenomicAlignments_1.8.4       nnet_7.3-12