# Error message! Oh no! What to check ###### tags: `3. Miscellaneous` 1. **PERMISSIONS**: See chmod cheatsheet. Always make sure to check that you have permission to read, write and execute from directories you are trying to use! Example error message when one of us created a folder and the other tried to output something to it without permission: `File not found: /work/noor_wgs/vcfs/L45/dmel_L45_2L.g.vcf.gz` 2. **SYNTAX ERRORS**: If you run into an error that says 'no positional argument is defined for this tool,' the first thing to check should be your syntax. Check if there is a missing or extra space in the string of arguments you added into the commands. Here is an example of error message that we ran into because there is a missing space between the end of argument and `\` before we go to the next line. ``` Illegal argument value: Positional arguments were provided ',../data/2021_09_21_fastq/vcfs/dmel_L19_chr2.vcf}' but no positional argument is defined for this tool. ``` The incorrect syntax example: ``` #some GATK command \ -I input_filename.vcf\ -O output_filename.vcf ``` The fixed command: ``` #some GATK command \ -I input_filename.vcf \ -O output_filename.vcf ``` **Note:** Remember to check a space after `\` as well. There shouldn't be space after `\`.