Help fix errors when starting the launcher

15:48.28 [main/ERROR] [FML]: Apache Maven library folder was not in the format expected. Using default libraries directory. 
15:48.28 [main/ERROR] [FML]: Full: C:\Users\name\.mcreator\gradle\caches\modules-2\files-2.1\org.apache.maven\maven-artifact\3.5.3\7dc72b6d6d8a6dced3d294ed54c2cc3515ade9f4\maven-artifact-3.5.3.jar 
15:48.28 [main/ERROR] [FML]: Trimmed: c:/users/name/.mcreator/gradle/caches/modules-2/files-2.1/org.apache.maven/maven-artifact/3.5.3/
15:49.02 [main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing     < [I am especially interested in this error]

17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]: +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+= 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]: The following texture errors were found. 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]: ================================================== 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]:   DOMAIN dragon_world_tools 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]: -------------------------------------------------- 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]:   domain dragon_world_tools is missing 1 texture 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]:     domain dragon_world_tools has 1 location: 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]:       mod dragon_world_tools resources at C:\MCreatorWorkspaces\dragon_world_tools\build\libs\modid-1.0.jar 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]: ------------------------- 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]:     The missing resources for domain dragon_world_tools are: 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]:       textures/blocks/.png 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]: ------------------------- 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]:     No other errors exist for domain dragon_world_tools 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]: ================================================== 
17:00.43 [main/ERROR] [FML.TEXTURE_ERRORS]: +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=

It seems that these errors do not affect the mod itself, but I want to know what the problem is and maybe fix them.