Error Font T2A/cmr/bx/n/10.95=labx1095 at 10.95pt not loadable. How to fix?

Question

TeX

In the log file:

! Font T2A/cmr/bx/n/10.95=labx1095 at 10.95pt not loadable: Metric (TFM) file n
ot found.
<to be read again> 
                   relax 
l.23 ...uation} this references equation \ref{eq1}
                                                  .
? 
! Emergency stop.
<to be read again> 
                   relax 
l.23 ...uation} this references equation \ref{eq1}
                                                  .
End of file on the terminal!

In the missfont.log file:
mktextfm labx1095
The error occurs only if there are links like \ref{eq1} in the text