Illegal unit of measure (pt inserted) with Tabularx

Question

I am working on a journal paper using the Overleaf website to compile it.

documentclass[runningheads]{llncs}
usepackage{tabularx} 
usepackage{multirow}

begin{document}

begin{table}[t]
caption{tabmle1}
label{tab2}
begin{center}
begin{tabularx}{textwidth}{|X|X|X|X|}
hline
textbf{Dataset} &  textbf{Metrics} & textbf{algo1} & textbf{algo2}   cline{1-4}
multirow{4}{4} {data1} & M1 & 5.36778  & 6.20198  cline{2-4}
& M2 & 5.16952 & 3.78941      cline{2-4}

& M3 & 8.92139  & 9.63108   cline{2-4}

&M4 & 0.07484 & - 1.16580   cline{1-4}
%hline
multirow{4}{4}{data2} & M1& 2.02522 &  6.48972  cline{2-4}
& M2 & 6.15882 &    9.69980  cline{2-4}

& M3 & 8.12485  & 8.68411   cline{2-4}

& M4& -1.16187 & - 11.55713   cline{1-4}
%hline
end{tabularx} 
end{center}
end{table}
end{document}

I am getting this error:
Illegal unit of measure (pt inserted).

<to be read again> 
                   relax 
l.33 end{tabularx}
                   
Dimensions can be in units of em, ex, in, pt, pc,
cm, mm, dd, cc, nd, nc, bp, or sp; but yours is a new one!
I'll assume that you meant to say pt, for printer's points.
To recover gracefully from this error, it's best to
delete the erroneous units; e.g., type `2' to delete
two letters. (See Chapter 27 of The TeXbook.

I am new to latex, I made some research and it indicates that this error may occur when having a line break  followed by square brackets, which is not the case for this code. Other suggests using Tabularx, it is already the used environment.
Furthermore, I can not really understand the source of this error.
Thank you in advance for any suggestions!

Zarko · Accepted Answer

Mostly off-topic, since your problem is already solved by comments.
I would use siunitx packages for writing columns with numbers:
documentclass[runningheads]{llncs}
usepackage{multirow, tabularx}
NewExpandableDocumentCommandmcxbf{O{>{centeringarraybackslash}X|}m}
     {multicolumn{1}{#1}{textbf{#2}}}
usepackage{siunitx}

begin{document}
    begin{table}[ht]
caption{Table 1}
label{tab2}
    centering
    renewcommandarraystretch{1.1}
begin{tabularx}{textwidth}{|X|X|S[table-format=-1.5]|S[table-format=-2.5]|}
    hline
mcxbf[|>{centeringarraybackslash}X|]{Dataset} 
    & mcxbf{Metrics} 
            & mcxbf{algo1} 
                        & mcxbf{algo2}   
    hline
multirow{4}{=}{data1} 
    & M1    & 5.36778   &  6.20198   cline{2-4}
    & M2    & 5.16952   &  3.78941   cline{2-4}
    & M3    & 8.92139   &  9.63108   cline{2-4}
    & M4    & 0.07484   & -1.16580  
hline
multirow{4}{=}{data2} 
    & M1    & 2.02522   &  6.48972   cline{2-4}
    & M2    & 6.15882   &  9.69980   cline{2-4}
    & M3    & 8.12485   &  8.68411   cline{2-4}
    & M4    & -1.16187  & -11.55713  
    hline
end{tabularx}
    end{table}
end{document}

Addendum:
You may liked design as suggested @{Mico in his comment below:

documentclass[runningheads]{llncs}
usepackage{booktabs, multirow, tabularx}
NewExpandableDocumentCommandmcxbf{O{>{centeringarraybackslash}X}m}
     {multicolumn{1}{#1}{textbf{#2}}}
NewExpandableDocumentCommandmlxbf{O{>{raggedrightarraybackslash}X}m}
     {multicolumn{1}{#1}{textbf{#2}}}
usepackage{siunitx}

begin{document}
    begin{table}[ht]
caption{Table 1}
label{tab2}
    centering
    renewcommandarraystretch{1.1}
begin{tabularx}{textwidth}{XX S[table-format=-1.5]S[table-format=-2.5]}
    toprule
mlxbf{Dataset} 
    & mlxbf{Metrics} 
            & mcxbf{algo1} 
                        & mcxbf{algo2}   
    midrule
multirow{4}{=}{data1} 
    & M1    & 5.36778   &  6.20198   
    & M2    & 5.16952   &  3.78941   
    & M3    & 8.92139   &  9.63108   
    & M4    & 0.07484   & -1.16580  
    midrule
multirow{4}{=}{data2} 
    & M1    & 2.02522   &  6.48972   
    & M2    & 6.15882   &  9.69980   
    & M3    & 8.12485   &  8.68411   
    & M4    & -1.16187  & -11.55713  
    bottomrule
end{tabularx}
    end{table}
end{document}

Illegal unit of measure (pt inserted) with Tabularx

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