I have tried to load it in different versions and i keep getting the same error. org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered

that pops up when i get into minecraft which sucks because its in my custom pack and this is one of my favorite go to mods. If you could fix it that would be awesome.

I have the same error
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
Caused by: org.spongepowered.asm.mixin.throwables.MixinApplyError: Mixin [curios.mixins.json:AccessorEntity] from phase [DEFAULT] in config [curios.mixins.json] FAILED during APPLY
Caused by: org.spongepowered.asm.mixin.gen.throwables.InvalidAccessorException: No candidates were found matching f_19803_:Z in net/minecraft/world/entity/Entity for curios.mixins.json:AccessorEntity->@Accessor[FIELD_GETTER]::getFirstTick()Z [INJECT Applicator Phase -> curios.mixins.json:AccessorEntity -> Apply Accessors -> -> Locate -> curios.mixins.json:AccessorEntity->@Accessor[FIELD_GETTER]::getFirstTick()Z]

i figure it out

u have to put the mixin configurations into the server, client, and data side in build.gradle
my game version is 1.20.1
i just saw the readme file under the 1.20.X branch

`client {
// Comma-separated list of namespaces to load gametests from. Empty = all namespaces.
property 'forge.enabledGameTestNamespaces', mod_id

        property 'mixin.env.remapRefMap', 'true'
        property 'mixin.env.refMapRemappingFile', "${projectDir}/build/createSrgToMcp/output.srg"
    }

    server {
        property 'forge.enabledGameTestNamespaces', mod_id
        args '--nogui'

        property 'mixin.env.remapRefMap', 'true'
        property 'mixin.env.refMapRemappingFile', "${buildDir}/createSrgToMcp/output.srg"
    }

    // This run config launches GameTestServer and runs all registered gametests, then exits.
    // By default, the server will crash when no gametests are provided.
    // The gametest system is also enabled by default for other run configs under the /test command.
    gameTestServer {
        property 'forge.enabledGameTestNamespaces', mod_id
    }

    data {
        // example of overriding the workingDirectory set in configureEach above
        workingDirectory project.file('run-data')

        // Specify the modid for data generation, where to output the resulting resource, and where to look for existing resources.
        args '--mod', mod_id, '--all', '--output', file('src/generated/resources/'), '--existing', file('src/main/resources/')

        property 'mixin.env.remapRefMap', 'true'
        property 'mixin.env.refMapRemappingFile', "${buildDir}/createSrgToMcp/output.srg"
    }`

I would need the whole crash report to decipher the cause, but most likely your issue may be coming from either Tiered or Inventorio. Please check if you have either of these mods installed and, if so, see if removing them fixes the issue.