minecraft 1.12.2 forge server crashes

[_martha_sama_]

i made a minecraft server for me and my friends to play on, the unmodded ver works fine but the forge one always runs out of heap space.

is there anything i can do?

the log:

Spoiler

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

// This doesn't make any sense!

Time: 2/24/19 9:10 AM
Description: Exception in server tick loop

java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Unknown Source)
    at java.lang.AbstractStringBuilder.ensureCapacityInternal(Unknown Source)
    at java.lang.AbstractStringBuilder.append(Unknown Source)
    at java.lang.StringBuilder.append(Unknown Source)
    at java.lang.StackTraceElement.toString(Unknown Source)
    at org.apache.logging.log4j.core.impl.ThrowableProxy.toExtendedStackTrace(ThrowableProxy.java:664)
    at org.apache.logging.log4j.core.impl.ThrowableProxy.<init>(ThrowableProxy.java:164)
    at org.apache.logging.log4j.core.impl.ThrowableProxy.<init>(ThrowableProxy.java:141)
    at org.apache.logging.log4j.core.impl.ThrowableProxy.<init>(ThrowableProxy.java:122)
    at org.apache.logging.log4j.core.impl.MutableLogEvent.getThrownProxy(MutableLogEvent.java:338)
    at org.apache.logging.log4j.core.pattern.ExtendedThrowablePatternConverter.format(ExtendedThrowablePatternConverter.java:61)
    at org.apache.logging.log4j.core.pattern.PatternFormatter.format(PatternFormatter.java:38)
    at net.minecraftforge.server.terminalconsole.HighlightErrorConverter.format(HighlightErrorConverter.java:100)
    at org.apache.logging.log4j.core.pattern.PatternFormatter.format(PatternFormatter.java:38)
    at org.apache.logging.log4j.core.layout.PatternLayout$PatternSelectorSerializer.toSerializable(PatternLayout.java:455)
    at org.apache.logging.log4j.core.layout.PatternLayout$PatternSelectorSerializer.toSerializable(PatternLayout.java:444)
    at org.apache.logging.log4j.core.layout.PatternLayout.toSerializable(PatternLayout.java:208)
    at org.apache.logging.log4j.core.layout.PatternLayout.toSerializable(PatternLayout.java:57)
    at net.minecraftforge.server.terminalconsole.TerminalConsoleAppender.append(TerminalConsoleAppender.java:320)
    at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
    at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
    at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:448)
    at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:433)
    at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:417)
    at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:403)
    at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
    at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:146)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2091)
    at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2011)
    at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1884)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
    Minecraft Version: 1.12.2
    Operating System: Windows 10 (x86) version 10.0
    Java Version: 1.8.0_191, Oracle Corporation
    Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
    Memory: 104752 bytes (0 MB) / 259522560 bytes (247 MB) up to 259522560 bytes (247 MB)
    JVM Flags: 0 total; 
    IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 104
    FML: ~~ERROR~~ NoClassDefFoundError: net/minecraftforge/common/util/TextTable$1
    Loaded coremods (and transformers): 
    Profiler Position: N/A (disabled)
    Player Count: 0 / 20; []
    Is Modded: Definitely; Server brand changed to 'fml,forge'
    Type: Dedicated Server (map_server.txt)

the mods im using are:
bibliocraft -2.4.5
biomesoplenty - 7.0.1.2425
cdm (mrcrayfish device mod) - 0.4.1
cfm (mrcrayfish furniture mod) - 6.2.0
chinjufumod - 3.2.2
custommobspawner- latest
customnpcs- 30jan19
drzharks mocreatures mod - 12.0.5
fastleafdecay - v14
optifine - HD EU3 (latest on the site)
pams harvestcraft - 1.12.2zb
tf2stuffmod - latest

 

if there is a solution to this that would be nice, thank you in advance!

[_martha_sama_]

how do i do that? tried doing what minecraft wiki and youtube tutorials told me and it said "Error occurred during initialization of VM
Could not reserve enough space for 2097152KB object heap"

what do i do now?