Dear Prof. Wolfgang; 
During running step-70. I found the following error  
Exception on processing: 

An error occurred in line <1360> of file 
in function
    void dealii::ParameterHandler::print_parameters(const string&, 
dealii::ParameterHandler::OutputStyle) const
The violated condition was: 
Additional information: 
    An input/output error has occurred. There are a number of reasons why 
this may be happening, both for reading and writing operations.

If this happens during an operation that tries to read data: First, you may 
be trying to read from a file that doesn't exist or that is not readable 
given its file permissions. Second, deal.II uses this error at times if it 
tries to read information from a file but where the information in the file 
does not correspond to the expected format. An example would be a truncated 
file, or a mesh file that contains not only sections that describe the 
vertices and cells, but also sections for additional data that deal.II does 
not understand.

If this happens during an operation that tries to write data: you may be 
trying to write to a file to which file or directory permissions do not 
allow you to write. A typical example is where you specify an output file 
in a directory that does not exist.

CMakeFiles/run.dir/build.make:57: recipe for target 'CMakeFiles/run' failed
make[3]: *** [CMakeFiles/run] Error 1
CMakeFiles/Makefile2:131: recipe for target 'CMakeFiles/run.dir/all' failed
make[2]: *** [CMakeFiles/run.dir/all] Error 2
CMakeFiles/Makefile2:138: recipe for target 'CMakeFiles/run.dir/rule' failed
make[1]: *** [CMakeFiles/run.dir/rule] Error 2
Makefile:144: recipe for target 'run' failed
make: *** [run] Error 2
Please guide me
Kaleem iqbal

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