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I want to insert some footnote with multiple references in a table. This is the code:

\begin{table}[h!]
\begin{tabular}{lcccccr}
\toprule
{ } & {mIOU (Fine)} & {FPS} & {Hardware} & {GFLOPS} & {n° PARAM} \\
\midrule
{Fast-SCNN} & {68,62} & {106,2} & {Titan Xp\footnote[3]{\url{https://www.nvidia ...

Oh it was simple! Thank you!

This code generate the following error:
! Extra alignment tab has been changed to \cr.

for all the 4 line of the table. Why? I cannot understand.

\begin{tabular}{lcr}
\toprule
{ } & {PASCAL VOC 2012} & {PASCAL Contex} & {CamVid} & {Cityscape} \\
{DeepLabv3+} & {89,0} & {-} & {-} & { 82,1 ...