Compiling issue in keil5, arm compiler 5

While building the project target I am getting this error which says to specify  the output name but when it was in keil4, this option of naming the output was not given and it was giving no error like this but after migrating this project this error pops up 

ERROR : FCARM - Output Name not specified, please check 'Options for Target - Utilities'

but after this I specified the name to output as"output" as shown below

After clicking 'ok' and building this project it throws other error as shown below

ERROR: C4065E: type of input file 'output' unknown

Please suggest for this error