| SIGMA_BLOCK_NOT_FOUND | Cannot find block '$block' | There is no block $block in the template | Check the block name spelling, check whether you added all the necessary blocks to the template | 
| SIGMA_BLOCK_DUPLICATE | The name of a block must be unique within a template. Block 'blockname' found twice. | The loaded block contains a subblock that has the same name as the existing one | Check the file contents and rename the block to something else | 
| SIGMA_TPL_NOT_FOUND | Cannot read the template file '$filename' | File is unreadable for some reason | Check if the file exists and has correct permissions set | 
| SIGMA_CACHE_ERROR | Cannot save template file 'filename' | A prepared template file cannot be saved | Check if the directory for prepared templates cache exists and is writeable for your script | 
| 
           SIGMA_CALLBACK_SYNTAX_ERROR
          | 
           Cannot parse template function: (error description)
          | 
           Bogus syntax for template function parameters.
          | 
           Fix the template function definition, pay special attention to
           quoting rules.
          |